QUESTION 27 In the circuit below; the switch has been open for long time, and the current zero everywhere. At time t=0 the switch closed_ What iS the current; through the vertical resistor immediately after the switch IS closed? (+ is in the direction of the arrow). A. V/R B.V/2R C. V/3R D. 0 .QUESTION 28 Referring the previous problem, assume the battery puts out 12 V If the switch has been closed long time, what is the voltage across the inductor immediately aiter the switch Is opened back up? A. 0 B.6V C. 12V D.24V

Answer:

Sound waves have a low speed of 330 m/s

Sound waves are mechanical waves

Electromagnetic waves have a greater speed of 3.0×10^8 m/s

Electromagnetic waves are due to disturbance of electromagnetic objects.

The work done by the force of 7 pounds acting at a 45-degree angle to the horizontal in moving the object 9 feet from (0,0) to (9,0) is 23 pounds-feet.

To find the work W done by a force of 7 pounds acting at a 45-degree angle to the horizontal in moving an object 9 feet from (0,0) to (9,0), we need to use the formula W = Fd cos(theta), where F is the force, d is the displacement, and theta is the angle between the force and the displacement. In this case, F = 7 pounds, d = 9 feet, and theta = 45 degrees. To use the formula, we first need to convert theta to radians by multiplying it by pi/180. So, theta in radians is (45*pi)/180 = pi/4. Now, we can plug in the values into the formula: W = (7 pounds)(9 feet)cos(pi/4) = (7)(9)(sqrt(2)/2) = 22.5 pounds-feet. Since the question asks us to round to the nearest whole number, we need to round 22.5 to 23 pounds-feet. Therefore, the work done by the force of 7 pounds acting at a 45-degree angle to the horizontal in moving the object 9 feet from (0,0) to (9,0) is 23 pounds-feet.

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Answer:

endoplasmic reticulum

Answer:

2m/s

.................

Answer:

A physical property is a characteristic of matter that is not associated with a change in its chemical composition.

Explanation:

A physical property is a characteristic of matter that is not associated with a change in its chemical composition. Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity.

hope it helps! Have a fantastic day!

Answer: Physical properties include density, color, hardness, melting and boiling points, and electrical conductivity.

Explanation: Pretty self explanatory I think but I hope it helped.

The average force the cylinder exerts on the nail while pushing it into the block is 196.6 N, expressed in the appropriate units.

To find the average force the cylinder exerts on the nail while pushing it into the block, we need to use the work-energy theorem. The theorem states that the net work done on an object is equal to its change in kinetic energy.

In this case, we can assume that all of the gravitational potential energy of the cylinder is converted into kinetic energy just before it hits the nail.

The initial potential energy of the cylinder is given by mgh, where m is the mass of the cylinder, g is the acceleration due to gravity, and h is the height from which the cylinder is dropped. Substituting the given values, we get:

Initial potential energy =\((20.0 )(9.81 )(1.50 ) = 294.3\)

The final kinetic energy of the cylinder just before it hits the nail is given by\((1/2)mv^2\), where v is the speed of the cylinder. We can solve for v by equating the initial potential energy to the final kinetic energy:

\(294.3 J = (1/2)(20.0 )v^2\)

\(v = \sqrt{2 * 294.3 J} ) / (20.0 kg)) = 3.42 m/s\)

Now, to find the average force exerted by the cylinder on the nail, we need to use the impulse-momentum theorem. This states that the impulse (change in momentum) of an object is equal to the force applied to it multiplied by the time during which the force is applied.

Since the cylinder comes to rest immediately after hitting the nail, we can assume that the time during which the force is applied is very short. Therefore, we can approximate the average force as the peak force, which is equal to the momentum change of the cylinder divided by the time it takes to stop.

The momentum of the cylinder just before it hits the nail is given by p = mv, where m is the mass of the cylinder and v is the speed we just calculated. Substituting the given values, we get:

p = (20.0 kg)(3.42 m/s) = 68.4 kg m/s

The momentum of the cylinder just after it hits the nail is zero, since it comes to rest. Therefore, the momentum change is simply equal to the initial momentum. To find the time it takes for the cylinder to stop, we need to use the kinematic equation v = at, where a is the acceleration of the cylinder while it is in contact with the nail, and t is the time during which the force is applied.

\(3.42 m/s = (9.81 m/s^2)t\)

t = 0.348 s

Now we can calculate the average force:

Average force = peak force = momentum change / time = 68.4 kg m/s / 0.348 s = 196.6 N

Therefore, the average force the cylinder exerts on the nail while pushing it into the block is 196.6 N, expressed in the appropriate units.

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Answer:

50.63 ft/s (2dp)

Explanation:

Speed = Distance/Time

80/1.58 = 50.63291139

= 50.63 ft/s (2dp)

Answer:

Distance, Mass

(a) The initial temperature is 373.95 K.

(b) The final temperature is 546.15 K.

(c) The total internal energy change of the fluid during this process is 515.4 kJ.

(d) The process can be represented as an isochoric heating process on the P-v diagram and as an isobaric expansion process on the T-v diagram.

(a) To find the initial temperature, we can use the saturated steam tables. At a pressure of 200 kPa, the corresponding saturation temperature is 373.95 K.

(b) Since the volume doubles, the process is an isochoric (constant volume) heating process. Using the ideal gas law, we can determine the final temperature. The initial and final volumes are related by the equation V_final = 2V_initial. Since the mass remains constant, the specific volume (v) is inversely proportional to the density (ρ). Therefore, ρ_final = ρ_initial/2. Using the ideal gas law, we can calculate the final temperature to be 546.15 K.

(c) The total internal energy change can be calculated using the equation ΔU = mC_vΔT, where m is the mass of the fluid and C_v is the specific heat at constant volume. Given the mass as 0.5 kg, the specific heat of water at constant volume, and the temperature change, we can find that the total internal energy change is 515.4 kJ.

(d) On the P-v diagram, the process is represented as a vertical line at 200 kPa, indicating constant pressure. On the T-v diagram, the process is shown as an upward-sloping line, indicating an isobaric expansion process. The initial state is represented as a point on the left, and the final state is represented as a point on the right. The path between the initial and final states is a straight line connecting these two points.

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↪Nucleons include protons and neutrons. All the positive charge of an atom is contained in the nucleus, and originates from the protons. Neutrons are neutrally-charged. Electrons, which are negatively-charged, are located outside of the nucleus.

☆...hope this helps...☆

_♡_mashi_♡_

The nucleus of an atom of any chemical element comprises three (3) distinct subatomic particles and these are:

An atom simply refers to the smallest, basic (fundamental) and indivisible unit which comprises the matter that forms all chemical elements.

Based on scientific information, the nucleus of an atom of any chemical element comprises three (3) distinct subatomic particles and these include the following;

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Answer:

11250Joules

Explanation:

1 half times 100kg times (15m/s) ^2

1. Squared the 15 =225m/s

2.times the kg to m/s- 100kg x 225m/s=22500

3. Divided by 2 = 11250Joules

KE= 11250J

If the pressure stays constant at atmospheric pressure, the balloon containing methane gas will have a volume of 4.80 L at 114 °C. However, if the pressure changes, the final volume will be different.

To solve this problem, we need to use the combined gas law equation, which relates the pressure, volume, and temperature of a gas,
(P1 * V1) / T1 = (P2 * V2) / T2
where P1 and P2 are the initial and final pressures (which we can assume to be constant), V1 is the initial volume, V2 is the final volume (what we're trying to find), T1 is the initial temperature, and T2 is the final temperature.

We're given that the initial volume (V1) is 2.40 L, the initial temperature (T1) is 57.0 °C, and the final temperature (T2) is 114 °C. We're trying to find the final volume (V2). We're not given the pressure, but we can assume it's constant (since the balloon isn't being compressed or expanding).

Plugging in the values we have, we get,

(P1 * 2.40) / 57.0 = (P2 * V2) / 114

We can simplify this equation by multiplying both sides by 114,

(P1 * 2.40 * 114) / 57.0 = P2 * V2

Now we can solve for V2 by dividing both sides by P2,

V2 = (P1 * 2.40 * 114) / (57.0 * P2)

Since we don't know the pressure, we can't solve for the exact final volume. However, we can make some assumptions. For example, if we assume that the pressure stays constant at atmospheric pressure (which is around 1 atm), we can plug that value in for P1 and P2:

V2 = (1 * 2.40 * 114) / (57.0 * 1) = 4.80 L

Therefore, the balloon carrying methane gas will have a capacity of 4.80 L at 114 °C if the pressure remains constant at atmospheric pressure. However, the ultimate volume will vary if the pressure varies.

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Answer:

ADE

Explanation:

Answer:

-A mover carries a box up a flight of stairs.

-Wind blows a pool chair across the yard.

-A weightlifter lifts a barbell off the ground.

Explanation:

TRUSTTTT A HOOOEEEE

Answer:

\(a=-3\ m/s^2\)

Explanation:

Given that,

Initial speed of a train, u = 12 m/s

Final speed of a train, v = 9.6 m/s

Time taken, t = 0.8 s

We need to find the average acceleration of the train. We know that the rate of change of velocity is equal to acceleration. So,

\(a=\dfrac{v-u}{t}\\\\a=\dfrac{9.6-12}{0.8}\\\\a=-3\ m/s^2\)

So, the average acceleration of the train is equal to \(-3\ m/s^2\).

Answer:

29.41%

Explanation:

Given that,

In 1630 at the beginning of European settlement, about 425,000,000 hectares of the United States were covered with trees.

By 2017, the area covered by trees was reduced to 300,000,000 hectares.

We need to find the percentage decrease in the area covered by trees between 1630 and 2017.

The percentage decrease in any value is given by :

\(\%=\dfrac{300,000,000 -425,000,000 }{425,000,000 }\times 100\\\\=29.41\%\)

So, the percentage decrease in the area covered by the trees is 29.41%.

Answer: Initial velocity is independent of the slope of the graph; that is, the acceleration. An object thrown downward still accelerates after release at the same rate as an object that is dropped.

Explanation: hope this helps

No.

A stone has the SAME acceleration whether you throw it down, throw it up, throw it sideways, or just drop it.

YOU decide the stone's initial velocity, but it always has the same acceleration after it leaves your hand.

Answer:

The weight would be the same

Explanation:

Just like Nazim who was on a scale, I had to stand on a scale and repeat what Nazim did in order to answer this question properly.

When one foot is lifted, the surface pressure reduces compared to when both feet were on the scale. This is because lifting the fiit makes the weight distribution to be less balanced thereby reducing it. But weight would still remain the same since the scale reads weight and not the pressure.

Answer:

more quickly on a hot day

Explanation:

The equation that states the law of conservation of energy is:

ΔE = q + w

Hence, the correct option is C.

In this equation, ΔE represents the change in energy of a system, q represents the heat transferred to or from the system, and w represents the work done on or by the system.

According to the law of conservation of energy, the total energy of a closed system remains constant; it can neither be created nor destroyed, only transferred or transformed from one form to another.

This equation expresses that the change in energy of a system is equal to the heat added or removed from the system plus the work done on or by the system.

Therefore, The equation that states the law of conservation of energy is:

ΔE = q + w

Hence, the correct option is C.

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CAR 1

Momentum = Mass/Velocity

M = 2100/20

M = 105 m/s^2

CAR 2

Momentum = Mass/Velocity

M = 2100/30

M = 70 m/s^2

The correct answer choice for the explanatory and response variables of a scatterplot depends on the context and the variables being studied.

The correct answer choice for the explanatory and response variables of a scatterplot depends on the context and the variables being studied.

In general, the explanatory variable is the independent variable, which is the variable being manipulated or controlled in the study.

The response variable is the dependent variable, which is the variable being measured or observed in response to changes in the explanatory variable.

For example, if we are studying the relationship between voltage and the rotation of an electric motor, then the explanatory variable would be voltage, and the response variable would be rotation.

As voltage is being manipulated, the resulting changes in the rotation of the motor are being observed and measured.

Conversely, if we are studying the relationship between rotation and the voltage required to achieve that rotation, then the explanatory variable would be rotation, and the response variable would be voltage.

As rotation is being manipulated, the resulting changes in the required voltage are being observed and measured.

It is important to carefully consider the variables and their relationships when interpreting a scatterplot.

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Answer:

Sunspots are places where the strong magnetic fields in the Sun resist the upward motion of bubbling hot gases from underneath

Explanation:

The range of a projectile as obtained from the calculation is 5.98 m/s.

The range is the distance that is covered by a projectile. The range of a projectile is given by the formula; R = u^2 sin 2θ/g

Where;

u = initial velocity

θ = angle turned

g = acceleration due to gravity

Now;

3.28 = u^2 sin 2(58)/9.8

u^2 = 3.28 * 9.8/ sin 2(58)

u = √3.28 * 9.8/ sin 2(58)

u =√32.144 /0.899

u = 5.98 m/s

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Answer: mixture

Explanation:

Answer:

soil is a mixture of minerals, dead and living organisms (organic materials), air, and water. These four ingredients react with one another in amazing ways, making soil one of our planet’s most dynamic and important natural resources.

Another definition of soil

The surface mineral and/or organic layer of the earth that has experienced some degree of physical, biological and chemical weathering.

In summary, soil is a mixture....

Answer:

The phenomenon that fits the description of going up and down continuously, getting larger as it spreads out, and retaining the same amount of joules until fully converted to heat and mechanical energy is a wave.

Explanation:

Waves exhibit a repetitive oscillation or vibration that can propagate through various mediums such as air, water, or solids. As a wave travels, it undergoes a pattern of upward and downward movement, referred to as oscillation or displacement.

The concept of spreading out refers to the wave's behavior of expanding or dispersing as it propagates through space. This can be observed in phenomena like sound waves spreading out in all directions or waves on the surface of water expanding outward.

Regarding the conservation of energy, waves typically conserve the total energy content while undergoing various transformations. In the case of waves, the energy carried by the wave remains constant, but it may change its form as the wave interacts with its surroundings. Ultimately, when the wave is fully converted to heat and mechanical energy, the total amount of energy remains the same.

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Answer:

stored

Explanation:

P. E . = m g h  

   represents STORED energy in the form of the height * acceleration of gravity * mass

The Weight of an object is more at pole and less at equator of the earth because the distance of the pole is less than the distance of the equator from the centre of the earth.

The answer option which is an example of the law of multiple proportions is: B) Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O: 1 g C and 2.66 g O: 1 g C.

The Law of Multiple Proportions is also referred to as Dalton's Law and it states that when two chemical elements combine to form more than one chemical compound, the masses (weights) of one chemical element that combine with a fixed mass (weight) of the other chemical element will always be in a ratio of small whole numbers.

According to the Law of Multiple Proportions, when two chemical elements combine to form two different chemical compound, the masses (weights) of one chemical element that combine with 1 gram of the other chemical element can be expressed as a ratio of small whole numbers.

For example, carbon and oxygen react to form either carbon monoxide and carbon dioxide.

Carbon monoxide (CO):

12 grams of C = 16 grams of O.

1 gram of C = 1.33 gram of O.

Carbon dioxide (\(CO_2\)):

12 gram of C = 32 grams of O.

1 gram of C = 2.66 gram of O.

Ratio of oxygen (O) = 16:32 = 1:2 (Law of Multiple Proportions).

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Your question is lacking the necessary answer options, so I will be adding them here:

A. A sample of chlorine is found to contain three times as much Cl-35 as Cl-37.

B. Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O: 1 g C and 2.66 g O: 1 g C.

C. Two different samples of table salt are found to have the same ratio of sodium to chlorine.

D. The atomic mass of bromine is found to be 79.90 amu.

E. Nitrogen dioxide always has a mass ratio of 2.28 g O: 1 g N.