consider an object floating on water. will it float higher, lower, or at the same level on the moon (at 1/6 the acceleration of earth’ gravity) as on earth? explain your answer.
Answers
An object floating on water will float at the same level on the Moon as on Earth, assuming there is a suitable liquid to support the object on the Moon.
This is because the buoyant force, which determines an object's floating level, depends on the displaced liquid's weight and not the gravitational acceleration. The concept of buoyancy is based on Archimedes' principle, which states that the upward buoyant force experienced by a submerged or partially submerged object is equal to the weight of the fluid displaced by the object.
Consider an object floating on water on Earth. The buoyant force acting on the object equals the weight of the water it displaces. The weight of an object depends on both its mass and the gravitational acceleration it experiences. Although the gravitational acceleration on the Moon is 1/6th that on Earth, this change in gravity would not affect the relative floating level of the object.
This is because the buoyant force and the weight of the object would both be affected by the change in gravitational acceleration, resulting in a proportional decrease in both forces. Since these forces remain proportional to each other, the object's floating level would remain the same. In reality, water would not exist in liquid form on the Moon's surface, but the principle of buoyancy still applies in hypothetical situations like this.
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Related Questions
What is SI unit?give examples
Answers
Answer:
The system of units which is agreed by the International Conference of Scientists held in France in 1960 A.D is called SI unit.
How do you work out Potential Difference???
Please can you make it simple :)
Thanks.
Answers
Answer:
Potential difference is the work done in moving a positive test charge from infinity to the point in question.
Voltage is an expression of PD. (Joules / Coulomb)
Say that a capacitor has a PD of 5 Volts. The work in moving a positive test charge from the positive plate to the negative plate is -5 Joules/Coulomb or -5 volt. (At the positive plate the positive test charge (1 Coulomb) already has a PD of + 5 Volts.)
If one soccer ball is rolling to the right at 3 m/s and another soccer ball is rolling left with a speed of 5 m/s, how much momentum is there in this system before they collide with each other? Both have a mass of 1 KG
Answers
Answer:
Final momentum after a head on collision is -2kgm/
Explanation:
One ball moves to the right and the other moves opposite and momentum is a vector quantity so that considering the direction
Initial momenta are P₁=2x3=6kgm/s P₂=4x(-2)=-8kgm/s
Final momentum is the vector sum of P(final)= 6-8= -2 kgm/s
According to the Law of Universal Gravitation, when the distance between the centers of two objects is doubled and the masses remain constant, the force between the objects is multiplied by a factor of Multiple Choice
a. 1 b. 4
c. 2
d. 0.5. e. 0.25.
Answers
The correct answer is e. 0.25. According to the Law of Universal Gravitation, the force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
This means that when the distance between the centers of two objects is doubled, the force between them is reduced to 1/4 of its original value.
Therefore, if the distance between the centers of two objects is doubled and the masses remain constant, the force between the objects is multiplied by a factor of 1/4, or 0.25. This is because the inverse square law states that the force decreases exponentially as the distance between the objects increases.
Understanding this law is important in many fields, including astronomy, physics, and engineering, as it helps to explain the behavior of celestial bodies and the forces that govern their motion.
According to the Law of Universal Gravitation, the gravitational force (F) between two objects with masses (m1 and m2) and a distance (r) between their centers is given by the equation:
F = G * (m1 * m2) / r^2
where G is the gravitational constant.
When the distance between the centers of the objects is doubled (2r), the new gravitational force (F') can be calculated as follows:
F' = G * (m1 * m2) / (2r)^2
Now, we can simplify this equation:
F' = G * (m1 * m2) / (4 * r^2)
From the original equation, we know that F = G * (m1 * m2) / r^2. Therefore, we can rewrite the new equation as:
F' = (1/4) * F
This shows that when the distance between the centers of two objects is doubled, the force between the objects is multiplied by a factor of 1/4 (0.25).
So, the correct answer is e. 0.25.
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a rock held above the ground has potential energy. as the rock falls, this potential energy is converted to kinetic energy. finally, the rock hits the ground and stays there. what has happened to the energy? group of answer choices the energy goes to producing sound and to heating the ground, rock, and surrounding air. it is transformed back into gravitational potential energy. the rock keeps the energy inside it in the form of mass-energy. the energy goes into the ground, and as a result, the orbit of the earth about the sun is slightly changed.
Answers
The correct option is A, The energy is converted to generating sound and heating the floor, rock, and surrounding air.
Energy refers to the property of an object or system that allows it to do work. Work is defined as the application of a force over a distance, and energy is required to accomplish this. Energy can exist in many forms, such as mechanical, thermal, electromagnetic, chemical, and nuclear.
The two main types of energy are kinetic energy and potential energy. Kinetic energy is the energy that an object possesses due to its motion, while potential energy is the energy that an object possesses due to its position or configuration. Energy is conserved, meaning that it cannot be created or destroyed but can only be transformed from one form to another. This is known as the law of conservation of energy,
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Complete Question;
A rock held above the ground has capacity power. because the rock falls, this capacity energy is transformed into kinetic power. eventually, the rock hits the floor and stays there. what has come about with electricity? organization of solution picks
A). The power is going to generate sound and heat the floor, rock, and surrounding air.
B). it is transformed lower back into a gravitational potential strength.
C). The rock maintains the power inner it in the form of mass energy.
D). The power is going into the ground, and as a result, the orbit of the Earth across the sun is slightly modified.
Jack travels 80 km in 50 minutes. What is his speed in m/s?
Answers
Answer:
1.6 m/s?
Explanation:
80 ÷ 50 = 1.6 m/s
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2) A skier stands at rest and begins to ski downhill with an acceleration of 3.0 m/s² {downhill). What is
her displacement after 15.0 seconds?
Answers
Answer:
her displacement s=337.5m
Explanation:
check out the above attachment ☝️
Displacement after 15.0 seconds s= 337.5 m
What is acceleration?
The rate of change of velocity is called acceleration.
Acceleration. speed is the charge of the exchange of displacement. Acceleration is the charge of the exchange of speed. velocity is a vector quantity because it consists of each significance and direction. Acceleration is also a vector quantity as it's far just the fee of alternate of pace.
Acceleration of 3.0 m/s²
Time= 15.0 seconds
S= ut + 1/2 at²
S = 0+0.5*3*15*15
=337.5 m
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Two masses of 12.00 kilograms and 7.50 kilograms, respectively, are connected to a pulley, as shown in the diagram at right. Initially, the 7.50 kilogram mass is held on the ground, but once released, the weight of the 12.00 kilogram mass causes the pulley to spin counterclockwise. Determine the speed of the 7.50 kilogram mass the moment the 12.00 kilogram mass hits the floor if it begins 3.00 meters above the floor.
Answers
Answer:
3.67 m/s
Explanation:
Mathematically, how does kinetic energy depend on speed? HINT: If speed doubles (from 11 m/s to 22 m/s), what happens to the kinetic energy?
Answers
Taking into account the definition of kinetic energy, the kinetic energy depends on the speed following the following expression Ec = 1/2×m×v² and if the speed is doubled, the kinetic energy is quadrupled.
Definition of kinetic energyKinetic energy is the energy possessed by a body or system due to its movement.
Kinetic energy is defined as the amount of work necessary to accelerate a body of a certain mass and in a position of rest, until it reaches a certain speed. Once the final speed is reached, the amount of kinetic energy accumulated will remain constant, that is, it will not vary, unless another force acts on the body again.
Kinetic energy is represented by the following expression:
Ec = 1/2×m×v²
Where:
Ec is kinetic energy, which is measured in Joules (J).m is mass measured in kilograms (kg).v is velocity measured in meters over seconds (m/s).Kinetic energy if speed doublesIn this case, if speed doubles, you know:
speed at start: v₁doubled speed: v₂= 2×v₁Replacing in the definition of kinetic energy:
When considering the speed at the start:Ec = 1/2×m×v₁²
When doubled speed is considered:Ec = 1/2×m×v₂²
Ec = 1/2×m×(2×v₁)²
Ec = 1/2×m×2²×v₁²
Ec = 1/2×m×4×v₁² or Ec = 4×1/2×m×v₁²
Finally, if the speed is doubled, the kinetic energy is quadrupled.
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Consider an extension of our Cobb-Douglas technology Y=AK
α
L
β
M
γ
where, in addition to the known variables, M is the amount of raw materials consumed in production. All parameters A,α,β,γ are strictly positive. What is the condition on the parameters that makes the technology constant returns to scale in K,L and M ? Increasing returns to scale? Hint: Observe that by setting γ=0, you will obtain the production function we used in class. Is your answer when you set γ=0 consistent with what we learned in class? Question 3.2 Consider the so-called constant elasticity of substitution (CES) technology Y=[aK
α
+bL
α
]
β
where a,b>0 and α and β are nonzero. What is the restriction on the parameters that makes the production function be constant returns to scale in K and L ?
Answers
The production function will have constant returns to scale if 2αβ = 1
Constant returns to scale (CRS) implies that if all inputs increase by a factor of λ, the output increases by λ as well. The requirement for constant returns to scale (CRS) in a Cobb-Douglas production function with a new input factor is given by the sum of exponents on all variables equal to 1.
In this case, Y = AKαLβMγ.
Thus, we have that α + β + γ = 1 for constant returns to scale in K, L, and M, because the sum of the exponents is 1.
If the sum of the exponents is less than 1, it indicates decreasing returns to scale. If the sum of the exponents is greater than 1, it indicates increasing returns to scale. If we take γ = 0, we obtain the production function used in class, which is Y = AKαLβ, thus α + β = 1 for constant returns to scale in K and L.
When γ = 0, the answer we get is consistent with what we learned in class. Now, we consider the constant elasticity of substitution (CES) technology, where Y = [aKα + bLα]β. The production function will have constant returns to scale (CRS) in K and L if the sum of the exponents of K and L is equal to 1.
Therefore, αβ + αβ = 1, implying 2αβ = 1.
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An ostrich lays the largest bird egg. A typical diameter for an ostrich egg at its widest part (diameter) is 12 cm (0.12 m). Suppose an egg of this size rolls
down a slope so that the centripetal acceleration of the shell at its widest part is 0.28 m/s2. What is the tangential speed of that part of the shell?
Answers
The centripetal acceleration is the ratio of the tangential speed and the
radius of the shell.
The tangential speed of the part of the shell is approximately 0.12961 m/s
Reasons;
The widest diameter of the egg, d = 12 cm = 0.12 m
The given centripetal acceleration, \(a_c\) = 0.28 m/s²
Required:
The tangential speed of the bird.
Solution;
\(\displaystyle Centripetal \ acceleration, \ a_c = \mathbf{\frac{v^2}{r}}\)
Where;
\(\displaystyle r = The \ radius \ of \ the \ egg \ shell = \frac{d}{2}\)
v = The tangential speed
Which gives;
\(\displaystyle r = \frac{0.12}{2} = 0.06\)
\(\displaystyle 0.28 \, m/s^2 = \frac{v^2}{0.06 \, m}\)
v² = 0.28 m/s² × 0.06 m = 0.0168 m²/s²
v = √(0.0168 m²/s²) ≈ 0.12961 m/s
The tangential speed, v = 0.12961 m/s
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A power station that is being started up for the first time generates 6120 MWh of energy over a 10 hour period. (i) If the rated power at full capacity is 660 MW, calculate how long it takes the power station to reach its full power output. (You may assume a constant increase in power from zero to full power) (ii) State what type of power station can be started up fastest and explain why the start-up times for other types of power station are slower. Explain briefly, how this is relevant to optimising the usage of windfarms. c) What is the Bremsstrahlung effect and how can it be avoided in shielding design? d) Sketch the electromagnetic field output from an antenna, describing in detail the two main regions in the output field.
Answers
(i)Therefore, it takes approximately 9.27 hours to reach its full power output.(ii)It is necessary to have quick-start power sources, this helps maintain a stable and reliable electricity supply even when wind speeds fluctuate.(c)The Bremsstrahlung effect needs to be considered to ensure proper radiation protection.(d) The near-field region is characterized by strong electric and magnetic fields while the far-field region represents the radiation zone.
(i) To calculate the time it takes for the power station to reach its full power output, we can use the formula:
Energy = Power × Time
Given that the power station generates 6120 MWh of energy over a 10-hour period and the rated power at full capacity is 660 MW, we can rearrange the formula to solve for time:
Time = Energy ÷ Power
Converting the energy to watt-hours (Wh):
Energy = 6120 MWh × 1,000,000 Wh/MWh = 6,120,000,000 Wh
Converting the power to watt-hours (Wh):
Power = 660 MW × 1,000,000 Wh/MW = 660,000,000 Wh
Now we can calculate the time:
Time = 6,120,000,000 Wh ÷ 660,000,000 Wh ≈ 9.27 hours
Therefore, it takes approximately 9.27 hours (or 9 hours and 16 minutes) for the power station to reach its full power output.
(ii) The type of power station that can be started up fastest is a gas-fired power station. Gas-fired power stations can reach full power output relatively quickly because they use natural gas combustion to produce energy.
In contrast, other types of power stations, such as coal-fired or nuclear power stations, have longer start-up times. Coal-fired power stations require time to heat up the boiler and generate steam, while nuclear power stations need to go through a complex series of procedures to ensure safe and controlled nuclear reactions.
This is relevant to optimizing the usage of windfarms because wind power is intermittent and dependent on the availability of wind. This helps maintain a stable and reliable electricity supply even when wind speeds fluctuate.
(c) The Bremsstrahlung effect is a phenomenon that occurs when charged particles, such as electrons, are decelerated or deflected by the electric fields of atomic nuclei or other charged particles. As a result, they emit electromagnetic radiation in the form of X-rays or gamma rays.
In shielding design, the Bremsstrahlung effect needs to be considered to ensure proper radiation protection. These materials effectively absorb and attenuate the emitted X-rays and gamma rays, reducing the exposure of individuals to harmful radiation.
(d) The electromagnetic field output from an antenna can be represented by two main regions:
Near-field region: This region is closest to the antenna and is also known as the reactive near-field. It extends from the antenna's surface up to a distance typically equal to one wavelength. In the near-field region, the electromagnetic field is characterized by strong electric and magnetic field components.
Far-field region: Also known as the radiating or the Fraunhofer region, this region extends beyond the near-field region.The electric and magnetic fields are perpendicular to each other and to the direction of propagation. The far-field region is further divided into the "Fresnel region," which is closer to the antenna and has some characteristics of the near field, and the "Fraunhofer region," which is farther away and exhibits the properties of the far-field.
The transition between the near-field and the far-field regions is gradual and depends on the antenna's size and operating frequency. The size of the antenna and the distance from it determine the boundary between these regions.
In summary, the near-field region is characterized by strong electric and magnetic fields, while the far-field region represents the radiation zone where the energy is radiated away as electromagnetic waves.
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A box has pushed across the floor for 5.2 M with a 48 N force how much work is done?
Answers
So force is 48 and displacement is 5.2 as given
Therefore 48 x 5.2
Which is 249.6
Approximately 250 J (joules)
I load a 0.4 kg marble into a slingshot and shoot it directly upward by applying a 36.2 N force
stretching it a distance of 10 cm. How fast is the marble traveling when it is initially released from
the slingshot? How high does the marble go?
Answers
Answer:50mph
Explanation:
motor a has a rating of 300 W Motor B has a rating of 200 W which motor is more powerful
Answers
The Motor A is more powerful than Motor B, because it has more power that is 300 W.
What is power?Power can be defined as the rate at which work is completed in a given amount of time.The formula is P = E/t, where P represents power, E represents energy, and t represents time in seconds. According to this formula, power is defined as the consumption of energy per unit of time.The term power refers to the rate at which energy is consumed. In other words, it is a measurement of how quickly you use energy. You are doing the same amount of work whether you run up a flight of stairs in 5 seconds or take a slow walk up the same flight in 40 seconds.So here since Motor A has more power that is 300 W then it performs more work per unit time.
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Compared to a 50-kg person, a 100-kg person at the beach requires ihe san aount of suntan lotion O twice as much suntan lotion. O less than twice as much suntan lotion.
Answers
Compared to a 50-kg person, a 100-kg person at the beach requires less than twice as much suntan lotion. This is because the amount of sunscreen needed is based on body surface area, which increases at a slower rate than body weight.
A 50-kg person has approximately 1.6 square meters of body surface area, while a 100-kg person has approximately 2.2 square meters. This means that the 100-kg person requires around 38% more sunscreen than the 50-kg person, which is less than double. It's important to note that the exact amount of sunscreen needed can vary based on individual factors such as skin type and level of sun exposure. It's always a good idea to follow the instructions on the sunscreen bottle and reapply as needed throughout the day to protect your skin from harmful UV rays.
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Using Maltab simulink, design AC Microgrid
contian of PV with MPPT and thremoelectricle generator with MPPT
and Battary storage system with state of charge control. Also
connect this mirogird to three
Answers
You will have to parameterize each component in the model this is done by double-clicking on each block and entering values in the parameters window.
To design an AC Microgrid containing PV with MPPT and thermoelectric generator with MPPT and Battery storage system with state of charge control in MATLAB Simulink
Step 1: Open SimulinkStart MATLAB Simulink by double-clicking on the icon. You will get a new window, ready to start a new model or open an existing one.
Step 2: Open Power System Blockset Library
Go to the Library browser and expand Power System Blockset Library.
Step 3: Add ComponentsAdd all the necessary components for your microgrid model by using the drag and drop method. They include:
Battery (Batteries)AC Voltage Source (Sources)
Thermal Converter (Converters)
DC/AC Inverter (Inverters)
MPPT Charge Controller (Control)
Grid Connection Point (Lines)
PV Panel (Renewables)
Thermoelectric Generator (Alternatives)
Step 4: Connect Components
Connect all the components in the model by dragging lines between the blocks.
You will have to use lines to connect the inverter to the battery, the solar panel to the MPPT, and the thermoelectric generator to the MPPT.
Step 5: Parameterization of Components
Next, you will have to parameterize each component in the model. This is done by double-clicking on each block and entering values in the parameters window.
Step 6: Check and Run the Model
Finally, you will have to check and run the microgrid model.
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At any given time, 181 kg of water is falling at 31.6 m/s over the canadian falls.
use the conservation of energy theorem to determine how high the canadian falls must be? (assume the water is in free fall with an initial speed of zero)
can you please show all your work? thank you!!!
Answers
The potential energy at the top of the falls is converted into kinetic energy as the water falls. Equating the initial potential energy to the final kinetic energy,the height of the Canadian Falls is approximately 49.7 meters.
What is the required height of the Canadian Falls?To determine the required height of the Canadian Falls, we can use the principle of conservation of energy. The initial kinetic energy of the falling water is zero (assuming initial speed is zero), and at the bottom of the falls, the entire gravitational potential energy is converted into kinetic energy. Using the equation for gravitational potential energy, PE = mgh, where m is the mass of the water, g is the acceleration due to gravity, and h is the height of the falls, we can solve for h. Rearranging the equation to solve for h, we find that the height of the Canadian Falls must be approximately 49.7 meters.
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View the graph of sun hours in a city.
Average Monthly Sun Hours in Addis Ababa, Ethiopia
300 hrs
150 hrs
0 hrs
Jan
Feb
Mar Apr May
Jul Aug Sep
Oct Nov
Dec
Jun
Month
It can be predicted that in the following year, this city can expect the hours of sunshine to significantly increase after
which month?
January
May
July
September
Answers
It can be expected in this city that the hours of sunshine will significantly increase after the month of July
What is the trend in the hours of monthly sunshine in Addis Ababa?The monthly hours of sunshine in the city is the average of daily sunshine in a month.
The trend as seen on th graph shows that monthly hours of sunshine is maximum between the months of December and January. Afterwards the monthly sunshine hours decreases.
Therefore, it can be expected in this city that the hours of sunshine will significantly increase after the month of July.
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A parallel plate capacitor is made of plates 1.0 sqm and has a separation of 1 mm. The space between the plates is filled with dielectric of εr = 25. If 1.0-kV potential difference is applied to the plates, find the force squeezing the plates together.
Answers
The force squeezing the plates of the parallel plate capacitor together is approximately 1,106,250 N.
To find the force squeezing the plates of a parallel plate capacitor together, we can use the formula:
F = (1/2) × ε₀ × εᵣ × A × (V/d)²
Where:
F is the force
ε₀ is the vacuum permittivity (ε₀ ≈ 8.85 × \(10^{-12\) F/m)
εᵣ is the relative permittivity (dielectric constant)
A is the area of the plates
V is the potential difference applied to the plates
d is the separation between the plates
Given:
Area of the plates (A) = 1.0 m²
Separation between the plates (d) = 1 mm = 0.001 m
Relative permittivity (εᵣ) = 25
Potential difference (V) = 1.0 kV = 1000 V
Now let's substitute the values into the formula to calculate the force:
F = (1/2) × ε₀ × εᵣ × A × (V/d)²
F = (1/2) × (8.85 × \(10^{-12\) F/m) × 25 × 1.0 m² × (1000 V / 0.001 m)²
Simplifying the calculation:
F = 0.5 × 8.85 × 25 × 1.0 × (10³ / \(10^{-3\))² N
F = 0.5 × 8.85 × 25 × 1.0 × 10^6 N
F ≈ 1106250 N
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explain why spraying and asphalt road with water will make it easier to walk across and bare feet on a hot sunny day
Answers
Spraying an asphalt road with water will make it easier to walk across and bare feet on a hot sunny day because it has a high specific heat capacity.
What is Specific heat capacity?This is referred to as the amount of heat which is required to raise the temperature of the unit mass of a given substance by a given amount.
Water as a compound has a very high specific heat capacity which means that it needs a high amount of heat for the temperature to change. This therefore means that when the water is sprayed on the surface, the road doesn't become too hot and can be walked on with the barefoot which makes it the correct reason.
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A squash ball hits a wall at a 45 degree angle. What is the direction (a) of the change in momentum of the ball, (b) of the force of the wall?
Answers
When a squash ball hits a wall at a 45 degree angle, the direction of the change in momentum of the ball is back toward the wall, and the direction of the force of the wall is also back toward the wall. This is because when two objects collide, the force of the collision is equal in magnitude and opposite in direction for both objects.
Since the ball was travelling in the direction of the wall when it collided, the force of the collision causes the ball's momentum to reverse direction and head back toward the wall.
Mathematically, this can be shown using the equations of conservation of momentum and Newton's 3rd law of motion. According to the equation of conservation of momentum, the momentum of an object before a collision is equal to the momentum of the object after the collision. Since the ball was travelling in the direction of the wall before it collided, its momentum changed direction to be heading back toward the wall after the collision.
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A metal block has a mass of 5 grams and a volume of 1 cm3. What is the density of a piece of the same identical metal but with a different shape and different volume
Answers
Answer:
ρ = Mass / Volume definition of density
ρ = 5 g / 1cm^3 = 5 g / cm^3
Since the other object is made of the same metal its density is the same:
ρ = 5 g/cm^3
The density of a piece of the same identical metal but with a different shape and different volume is \(\rho = 5 g/cm^3\).
What is density?The density of a substance is its mass per unit volume. Density gives information about how tightly the substance is packed together. The formula for density is
\(\rho ={\frac {m}{V}}\)
Unit of density is grams per cubic centimetre.
What are uses of density?One of the most common uses of density is in how different materials interact when mixed together.Wood floats on water because it has a lower density than water, while an anchor sinks as the metal has high density.Balloons filled with helium gas float because the density of the helium is low than the density of air.Given:
Mass, \(m = 5 g\)
Volume, \(V = 1 cm^{3}\)
The density of metal is
\(\rho = \frac{5}{1}\\ \\\rho = 5 g/cm^{3}\)
Since, the other object is made of the same metal. So, density is the same.
\(\rho = 5 g/cm^3\)
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400cm³ of alcohol of density 800kg/m³ is mixed with 600cm³ of water of density 1g/m³. Calculate the density if the mixture in SI units
Answers
After considering the given data we come to the conclusion that the density of the mixture is 321 kg/m³ in SI units, under the condition that 400cm³ of alcohol of density 800kg/m³ is mixed with 600cm³ of water.
To evaluate the density of the mixture, we can apply the formula
Density = (alcohol mass + mass of water) / (volume of alcohol + volume of water)
It is known to us that 400cm³ of alcohol of density 800kg/m³ is mixed with 600cm³ of water of density 1g/m³, we can evaluate the mass of alcohol and water as follows
Mass of alcohol = Volume of alcohol × Density of alcohol = 400cm³ × 800kg/m³ = 320000g
Mass of water = Volume of water × Density of water = 600cm³ × 1g/m³ = 600g
Total mass = Mass of alcohol + Mass of water = 320000g + 600g = 320600g
Total volume = Volume of alcohol + Volume of water = 400cm³ + 600cm³ = 1000cm³
Density = Total mass / Total volume
Density = 320600g / (1000cm³ × (1/1000) kg/cm³)
Density ≈ 321 kg/m³ in SI units.
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When is the photoelectric effect observed?
Answers
The photoelectric effect is observed when light interacts with matter, specifically when photons (particles of light) transfer their energy to electrons in an atom or a material. The correct answer is A. When an electric current results from light shining on a surface.
In the early 20th century, Albert Einstein provided a groundbreaking explanation of the photoelectric effect, which earned him the Nobel Prize in Physics in 1921. His work established the dual nature of light, both as a wave and as a particle (photon). Here's a detailed explanation of the photoelectric effect:
When light shines on a surface, it is composed of photons that carry energy. These photons interact with electrons in the material. The photoelectric effect occurs when photons transfer their energy to electrons, causing them to be emitted from the material.
The process can be described in several steps:
1. Absorption: When a photon with sufficient energy interacts with an electron in an atom or material, it can be absorbed. The energy of the photon is transferred to the electron, promoting it to a higher energy level or even releasing it from the atom.
2. Ejection: If the energy of the absorbed photon is greater than or equal to the binding energy of the electron (also known as the work function), the electron can be ejected from the material. The work function represents the minimum energy required to remove an electron from the material's surface.
3. Electron emission: The ejected electron can now contribute to the formation of an electric current. If there is a conducting material connected to the surface, the released electron can move through the material, resulting in the flow of electric charge.
The photoelectric effect is not observed when light acts solely as a wave (option B). While light does exhibit wave-like properties, such as interference and diffraction, these phenomena do not directly involve the transfer of energy from photons to electrons.
Option C, "When an electric current causes light to be produced," does not accurately describe the photoelectric effect. The photoelectric effect involves the emission of electrons due to the interaction of light with matter, but it does not directly produce light as a result of an electric current.
Option D, "Any time an electric current is produced," is a broad statement that encompasses various phenomena beyond the photoelectric effect. Electric currents can be produced in various ways, such as through the flow of charged particles or the movement of electrons in a conductor. The photoelectric effect is a specific phenomenon that occurs when light interacts with matter and results in the emission of electrons.
To summarize, the photoelectric effect is observed when light shines on a surface, and the energy of photons is transferred to electrons, leading to their emission from the material. This emission of electrons can result in the formation of an electric current.
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I think it is the question:
When is the photoelectric effect observed?
A. When an electric current results from light shining on a surface
B. When light acts as a wave
C. When an electric current causes light to be produced
D. Any time an electric current is produced .
If the mirror moves at 1.5m/s towards Peter while Peter remains at rest, what will he observe? Explain your reasoning
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Answer:
Peters image will grow bigger
Explanation:
In this situation, only Peter is at rest and the mirror is in motion at 1.5m/s heading towards Peter.
From afar, Peter will look small in the mirror that is his image will be small When the mirror is moved at 1.5m/s Peter being the observer will notice that his image grows bigger and bigger.
Stopping distance of vehicles When brakes are applied to a moving vehicle, the distance it travels before stopping is called stopping distance. It is an important factor for road safety and depends on the initial velocity (v0) and the braking capacity, or deceleration that is caused by braking. A car travelling at speed 72km/hr suddenly applies the brake with the deceleration of 5m/s2. Find the stopping distance of the car.
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Answer:
Stopping distance = 40m
Explanation:
Given the following :
Initial speed of vehicle before applying brakes = 72km/hr
Converting km/hr to m/s:
72km/hr = [(72 * 1000)m] / (60 * 60)
72km/hr = 72,000m / 3600s
72km/hr = 20m/s
Deceleration after applying brakes (-a) (negative acceleration) = - 5m/s^2
From the 3rd equation of motion:
v^2 = u^2 + 2as
Where v = final Velocity ; u= Initial Velocity ; a = acceleration and s = distance
Final velocity when the car stops will be 0
Therefore ;
v^2 = u^2 + 2as
0 = 20^2 + 2(-5)(s)
0 = 400 - 10s
10s = 400
s = 400/10
s = 40m
Therefore, the stopping distance of the car = 40 meters
An electron’s position cannot be known precisely. Only its probability of being in a certain location can be known. True or false?.
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The statement is TRUE! The precise or specific location of an electron cannot always be known or determined, regardless of what we do.
We can only assume it exists somewhere. It is also known as the "electron cloud model." It demonstrates that we can find electrons by considering "the probability of being in a certain location."
One of the theories that I believe explains this strange physics is the Principle of Heisenberg's Uncertainty. This equation describes electron wave-particle duality.
The peculiarities of the quantum realm have been repeatedly demonstrated. Knowing more means admitting that we know less.
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Don't mind this, just figuring something out
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Answer:
ok
Explanation:
Have a nice day!
As an object fall in a gravitational field, its speed increases. This is an example of potential energy transforming into what?
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Answer:
potential energy is transformed into kinetic energy