When a body is moving in a straight line with uniform acceleration, we can establish relation between velocity of the body, acceleration of the body and the distance traveled by the object in a particular time by a set of equations. These are called equations of motion.

A car acquires a velocity of 72 km/h in 10 seconds starting from rest. Choose the correct option for the questions below using your knowledge about the equations of motion.

1. The average velocity of the car expressed in SI unit will be –

The erector spinae muscles are a group of muscles that extend along the back of the spine. The origin of the erector spinae muscle group is complex, and it varies depending on the specific muscle within the group.

What is Erector Spinae?

The erector spinae muscles are responsible for extending the spine, or bending the spine backwards, as well as for helping to maintain proper posture and balance. They also play a role in lateral flexion and rotation of the spine. These muscles are important for many everyday activities, such as standing, walking, lifting, and bendin

The erector spinae muscles are important for maintaining proper posture, supporting the spine, and allowing movement of the back. They are also involved in activities that require bending, twisting, and lifting.

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Resistors & Notations In Series In Parallel

A, B A + B A | B

A, B, C, D A+B+C+D A | B | C | D

In Combination Example A | B | ( C + D ) A | B | ( C + D )

Dec 1 2020

Answer:

A ther mody namic system absorbs 300J of heat and at the same time 400J of work is done onit calculate the change

Answer:

Explanation:

Using the equation of motion to get the acceleration due to gravoty of the rock on the planet.

S = ut+ 1/2at² where;

S is the distance of the rock above the surface of the planet = 100m

u is the initial velocity = 15m/s

a is the acceleration due to gravity

t is the time taken by the rock to reach the ground = 10s

Since the rock is thrown upward the acceleration due to gravity will be negative i.e a= -g

The equation becomes S = ut- 1/2gt²

Substituting the given value to get the time t

100 = 15(10)- 1/2g(10)²

100 = 150-50g

100-150 = -50g

-50 = -50g

g = -50/-50

g = 1m/s²

Hence the acceleration due to gravity of the rock when it is on Planet XX is 1m/s²

Arrangement from the smallest relative mass to the largest relative mass

gamma radiation → beta particles → alpha particles

A radioactive atom will naturally emit radiation in the form of energy or particles in order to transition into a more stable state. The difference between radioactive material and the radiation it emits must be made. The process of radioactive decay is how an unstable atomic nucleus loses energy through radiation. A substance that has unstable nuclei is regarded as radioactive. Alpha, beta, and gamma decay are three of the most prevalent forms of decay, and they all entail the emission of one or more particles.

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Answer:

True.

Explanation:

One can expect good quality produce if proper attention is given to the proper selection of planting materials.

Answer:

57600 m and hour

Explanation:

Answer:

At a distance of 20.0m from a sound source, the intensity of the sound is 60.0 dB. What is the intensity (in dB) at a point 2.00m from the source? Assume that the sound radiates equally in all directions from the source.

Answer:

answer the question i have asked go to my account

Explanation:

can i get brainliest

Answer:

yes you can go on your account

For someone with a negative Weber slope for weight detection, it would be easier to tell the difference between 20 pounds and 21 pounds.

The Weber's Law states that the just noticeable difference (JND) between two stimuli is proportional to the magnitude of the stimuli. A negative Weber slope indicates that the JND decreases as the magnitude of the stimuli increases. In this case, as the weight increases, the person's ability to discriminate between the weights becomes easier.

Therefore, option C, telling the difference between 20 pounds and 21 pounds, would be easier for someone with a negative Weber slope for weight detection.

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The runner's center of mass will be  0.40 meter raised during the jump.

Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.

Initial vertical speed of the Olympic  runner = 2.8 m/s

Acceleration due to gravity = 9.8 m/s²

Mass of the Olympic  runner = 65 kg

Hence, the runner's center of mass will be raised during the jump

=  (Initial vertical speed )² ÷ (2 ×  Acceleration due to gravity)

= 2.8²/(2 ×9.8) meter

= 0.40 meter.

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A) Minimum recommended spiral parameter: 150.03m.

b) Distance P: 150.03m.

c) Distance Q: 4.122m.

d) Angle Φs: 16°30'14.0".

e) Distance Tc: 150.03m.

a) Calculation for the minimum recommended spiral parameter:

Design radius (R) = 300 m

Maximum superelevation (e_max) = 0.06 m/m

Spiral Parameter (A) = (R + e_max) / 2

A = (300 m + 0.06 m/m) / 2

A ≈ 150.03 m

b) Calculation for the distance P:

Distance P is equal to the length of the first spiral curve, which is the same as the minimum recommended spiral parameter.

P ≈ 150.03 m

c) Calculation for the distance Q:

Distance Q represents the length of the circular curve. It is given by the formula:

Q = (Deflection angle at Point of Intersection) / (Degree of Curve, D)

Deflection angle at Point of Intersection = 16°30'14.0"

Converting the angle to decimal degrees:

16° + (30'/60) + (14.0"/3600) = 16.504°

Q = 16.504° / (360° / D)

Q ≈ D / 21.814

Since the RAU80 has 4 lanes, the degree of curve (D) is 360° / 4 = 90°.

Q ≈ 90° / 21.814

Q ≈ 4.122 m

d) Calculation for the angle Φs:

The angle Φs is the deflection angle at the Point of Intersection.

Φs = 16°30'14.0"

e) Calculation for the distance Tc:

Distance Tc is equal to the length of the second spiral curve, which is the same as the minimum recommended spiral parameter.

Tc ≈ 150.03 m

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The gravitational acceleration of something with a counterweight of 4500 can be calculated using the following formula: Therefore, we cannot calculate the gravitational acceleration without knowing the mass of the object.

Gravitational acceleration is the rate at which objects accelerate due to the force of gravity. It is denoted by the symbol "g" and is defined as the acceleration due to gravity on the surface of a planet or other object in the presence of a gravitational field. The value of gravitational acceleration depends on the strength of the gravitational field and the mass of the object.

Gravitational acceleration is a fundamental concept in physics and is a key parameter in the study of celestial mechanics and the motion of objects in space. It is used to calculate the orbits of planets and satellites around the Earth and other celestial bodies, and is also important in the study of black holes and the structure of the universe.

Weight of object (W) = Mass of object (m) × Gravitational acceleration (g)

Therefore, g = W/m

We are given the weight of the object as 4500.

But, we do not have the mass of the object.

Therefore, we cannot calculate the gravitational acceleration without knowing the mass of the object.

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Answer: the acceleration needed will be 2.1 m/s²

The value for the specific latent heat of the vaporization of water, based on the given information, is 3,000,000 J/kg. So the correct option is D. 3 000 000 J/kg​.

To determine the value for the specific latent heat of vaporization of water using the given information, we can apply the principle of conservation of energy.

The power of the kettle is given as 2 kW, which means it consumes 2000 Joules of energy per second. As the kettle is left on for 5 minutes (300 seconds), the total energy consumed is:

Energy = Power × Time

Energy = 2000 J/s × 300 s

Energy = 600,000 J

This energy is used to vaporize the water. Given that the balance reading changes by 0.2 kg, we know that 0.2 kg of water has been converted to steam.

To find the specific latent heat of vaporization (Lv), we divide the total energy consumed by the mass of water vaporized:

Lv = Energy / Mass

Lv = 600,000 J / 0.2 kg

Lv = 3,000,000 J/kg

Therefore, the value for the specific latent heat of vaporization of water, based on the given information, is D. 3,000,000 J/kg.

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Answer:

The mouse exerts a force on the ground and the ground exerts an equal and opposite reaction force on the mouse.

At point B, Alberto's distance covered increases with time, equal distance is covered in equal time interval. The speed increases uniformly. At the point C to D, the distance covered with time remains the same. At the point D, equal distance is no longer covered in equal time intervals.

According to the law of inertia, an object will remain at rest or in a state of uniform motion unless it is acted upon by an unbalanced force. This means that smokey mouse will continue moving uniformly unless a force acts on it.

From Newton's second law; F = ma and a = F/m. F = force , m= mass, a = acceleration. This implies that smokey mouse can increase its speed by;

Increasing the force acting on the mouse

Decreasing the mass of the mouse

Action and reaction is encountered as the mouse is walking. The mouse exerts a force on the ground and the ground exerts an equal and opposite reaction force on the mouse.

Explanation:

Answer:

Protons, Electrons, and neutrons

Answer:

protons electrons neutrons

Explanation:

Answer:

30,000 kgm/s

Explanation:

m = 1000 kg

v = 30 m/s

Plug those values into the equation:

p = mv

p = (1000 kg)(30 m/s)

p = 30,000 kgm/s

The momentum of a 1000 kg sports car traveling at 30 m/s is 30,000 kgm/s.Linear momentum = Mass x Speed.

The product of an object's mass, m, and its velocity, v, is the vector quantity known as linear momentum. It is represented by the letter "p," which is also used to denote momentum.

Mass of car = 1000 kg

Speed by which car moves = 30 m/s. The momentum of the car =?

Recall that:

Linear momentum = Mass x Speed

= 1000 kg x 30 m/s.

= 30,000 kgm/s

The sum of an object's mass (m) and velocity (v) is known as the object's linear momentum. An equation can be used to explain this relationship. Momentum is defined as the body's mass times its velocity. P = m times v, etc.

Therefore,  the momentum of a 1000 kg sports car is 30,000 kgm/s if travels at 30 m/s.

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Answer:

A.) a bicycle moving at a constant speed on a straight, level road.

Explanation:

Force is given by the multiplication of mass and acceleration.

Mathematically, Force is;

\( F = ma\)

Where;

F represents force measured in Newton.

m represents the mass of an object measured in kilograms.

a represents acceleration measured in meter per seconds square.

In Physics, when the net force acting on a body or an object is equal to zero (0); the body or object is said to be in a state of equilibrium because it is not accelerating. This ultimately implies that, an object whose net force is equal to zero is either moving with a constant speed or the object is static i.e not moving at all.

In this scenario, the situation in which the net force on the object is equal to zero would be a bicycle moving at a constant speed on a straight, level road because it is at equilibrium and as such its resultant force is equal to zero.

The net force on the object (bicycle) is zero due to its constant speed on a straight levelled road. Hence, option (A) is correct.

The given problem is based on the Newton's second law to define net force. The net force on any object is an external effort by which the object change its speed with respect to time or tends to change the state of its motion. The mathematical expression for the net force is,

F = ma

Here, F is the net force, m is the mass of object and a is the acceleration of object.

Thus, we conclude that the net force on the object (bicycle) is zero due to its constant speed on a straight levelled road. Hence, option (A) is correct.

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The distance and direction between start and finish. - displacement

The size of a quantity. - magnitude

The process by which an object moves from one location to another. - motion

Quantities that can only be characterized by their magnitude. - scalars

Quantities that have both magnitude and direction. - vectors

An object's speed and direction are measured. - velocity

Measurement of the rate of change in an object's velocity over time. - acceleration

How steep the line on a graph is; run /rise. - slope

Graphs are used for a variety of purposes, but their main function is to help visually represent data or information in a clear and concise way. Graphs can be used to illustrate patterns, relationships, and trends that may not be easily apparent from looking at raw data.

For example, graphs can be used to show changes in variables over time, compare the values of different variables, or highlight the relationship between two variables. They can be used in many different fields, including science, economics, business, and social sciences.

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We can use the formula:

P = VI

where P is the power in watts, V is the voltage in volts, and I is the current in amperes.

For a 75-watt lightbulb,

75 = 120 × I

I = 0.625 A

To find out how many bulbs can be used without blowing a 17 A fuse, we divide the maximum current by the current for one bulb:

17 A / 0.625 A = 27.2

Therefore, we can use 27 75-watt lightbulbs without blowing a 17 A fuse.

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Answer:

Mac’s Speed = 2.5 m/s

Tosh’s Speed = 4 m/s

Tosh moves 1.5 m/s faster than Mac.

Explanation:

Tosh starts from an initial position of 12m and in a span of 3 seconds, (1.00 seconds to 4.00 seconds) he moves 12 meters.

So his speed is distance / time

s = 12 / 3

s = 4 m/s

Mac starts from an initial position of 2m and in a span of 4 seconds, he traveled 10m (2.00m to 12.00m).

Speed = Distance / time

s = 10 / 4

s = 2.5 m/s

"x can be any value between -1.00 m and 0, since the electric potential will be zero at any point where the distance between the charge and the point of measurement is equal to the magnitude of the charge divided by Coulomb's constant. The exact value of x will depend on the specific charge and units being used.

To find the value of x where the electric potential is zero, we can use the equation for electric potential:
V = kQ/r
where V is the electric potential, k is Coulomb's constant, Q is the charge creating the electric potential, and r is the distance between the charge and the point at which we are measuring the electric potential.
In this case, we are looking for the point where the electric potential is zero, so we can set V = 0 and solve for x:
0 = kQ/(x + 1.00)
Multiplying both sides by (x + 1.00), we get:
0 = kQ
Solving for x, we find that x can be any value between -1.00 m and 0, since the electric potential will be zero at any point where the distance between the charge and the point of measurement is equal to the magnitude of the charge divided by Coulomb's constant. The exact value of x will depend on the specific charge and units being used.
Therefore, the answer to the question is that x can be any value between -1.00 m and 0, and the electric potential at that point will be zero. It is important to express the answer with appropriate units, in this case meters.

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All for the sattement A, B, and E is True and satement C, D, and F is False where you learned about astronomy from space.

A .The Compton, Chandra and Spitzer telescopes are all examples of space telescopes.

-This statement is True.

B. Most types of electromagnetic waves are not visible to ground-based telescopes.

-This statement is True.

C. Enough infrared energy gets to Earth's surface that infrared telescopes do not need to be put in orbit.

-This statement is False.

D. Cosmic rays are the absolute highest-energy type of electromagnetic wave.

-This statement is False.

E. The Hubble Space Telescope makes observations at all wavelengths.

-This statement is True.

F. Earth's atmosphere has no effect on visible light, so there is no need to place an optical telescope in space.

-This statement is False.

Astronomy is the scientific study of celestial objects and phenomena, including stars, planets, galaxies, and the universe as a whole. Astronomers use various tools and techniques, such as telescopes, spectroscopy, and astrophysics, to observe and understand the properties and behavior of these celestial objects.

Through the study of astronomy, scientists have discovered many fascinating things about the universe, such as the existence of black holes, the age and size of the universe, and the formation and evolution of stars and galaxies. Astronomy has also played a significant role in advancing our understanding of fundamental physics, including the laws of gravity and the behavior of matter and energy at extreme conditions.

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Answer:

C. a disturbance that travels through a medium with a transfer of energy and without a transfer of matter

Explanation:

A wave is any disturbance that transfers energy from one location to the other via a substance called medium. It is important to note that a wave only conveys energy and not matter. For example, sound wave is a type of wave that carries sound energy from one place to another via mediums such as water, air etc.

Hence, according to this question, a wave can be described as a disturbance that travels through a medium with a transfer of energy and WITHOUT A TRANSFER OF MATTER.

The strength of the magnetic field at the center of the solenoid is 1.26 x 10^-2 T.

An area of space known as a magnetic field is where a magnetic force is applied to a magnetic item. It is produced by electric charges moving, such as electrons moving in an electric current or electrons moving in the atoms and molecules of magnetic materials.

A magnetic field has both a magnitude and a direction because it is a vector field. While the direction of the magnetic field is determined by the direction of the magnetic force it exerts on a north magnetic pole, the strength of the magnetic field is measured in units of tesla (T).

To calculate the magnetic field at the center of the solenoid:

B = μ₀ * n * I

Where:

μ₀ is the permeability of free space (4π x 10^-7 T·m/A)

n is the number of turns per unit length (in this case, n = N/L, where N is the total number of turns and L is the length of the solenoid)

I is the current

We can calculate n as:

n = N/L = 500 turns / 0.10 m = 5000 turns/m

Now we can substitute the values into the equation:

B = μ₀ * n * I = (4π x 10^-7 T·m/A) * (5000 turns/m) * (4.0 A)

B = 1.26 x 10^-2 T

Therefore, the strength of the magnetic field at the center of the solenoid is 1.26 x 10^-2 T (tesla).

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