A car moving with a velocity of 20 meters/second has1.8 * 105 joules of kinetic energy. What is the mass of the car?

Answers

Answer 1

Answer: Kinetic energy is the product of mass and the square of the velocity of the moving object. In this case, we substitute the given data, that is 1.8 x10^5 joules = m * (20 m/s2)^2. Extracting the mass, the mass of the car therefore is equal to 450 kg

Answer 2

Answer:

Explanation :

Given that,

Velocity of the car, v = 20 m/s

Kinetic energy of the car, $E_k=1.8* 10^5\ J$

Kinetic energy is given by :

$E_k=(1)/(2)mv^2$

$m=(2E_k)/(v^2)$

So, $m=(2* 1.8* 10^5\ J )/((20\ m/s)^2)$

m = 900 kg

Hence, the mass of the car is 900 kg

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Which of these is equivalent to the law of conservation of energy?A. The total mechanical energy is always conserved.
B. Friction is a nonconservative force.
C. Kinetic energy can be transformed into thermal energy.
D. The total energy of all types remains the same in a closed system.

Answers

The Law of the Conservation of Energy is stating that the total mechanical energy is always conserved or in simpler terms, not used or saved.

Answer: The correct option A.

Explanation:

Law of conservation of energy states that energy can neither be created nor be destroyed. But it can be transformed from one form to another.

Law of conservation of Mechanical energy states that mechanical energy of the closed system remain constant until dissipative forces are absent. This means that potential energy gets converted in kinetic energy or vice versa.

Mechanical energy is defined as the sum of the both potential and kinetic energies.

M.E = P.E + K.E

So, from the given options the correct answer is option A.

Which phenomena did Michael Faraday explore to help him invent the motor and the generator?motion and magnetism

motion and light

electricity and motion

electricity and magnetism

Answers

To Build The Motor, Faraday Studied Electricity And Magnetism. Hope This helps!

For Invention of "Motor" and "Generator", Micheal Faraday did explore electricity and magnetism, he postulated his three laws of "Electromagnetic Induction" and two laws of "Electro-chemistry".

In short, Option D) Electricity and Magnetism would be your answer.

Hope this helps!

Which describes the relationship between potential and kinetic energy of a ball thrown up in the air as it falls back to the ground? A.
Gravitational potential energy increases; kinetic energy increases.

B.
Kinetic energy equals gravitational potential energy.

C.
Kinetic energy increases; gravitational potential energy decreases.

D.
The mass of the ball is required to answer this.

Answers

The ball originally contains potential energy and no kinetic energy, therefore we can use the theory of conservation of mechanical energy. Its total energy, which is made up of the KE and PE, is constant and equal to its starting PE as it falls. Thus, option C is correct.

What potential and kinetic energy of a ball thrown up?

As the ball falls toward the ground, its gravitational potential energy is transformed into kinetic energy. The kinetic energy of the ball will increase as it accelerates until it collides with something. The ball's collision generates kinetic energy, which is transformed into several forms of energy.

As it rises, the ball's speed slows until the very apex of its motion, where it briefly pauses. At the peak, it accelerates at -9.8 m/s2.

Therefore, A ball is thrown up into the air, yet although though it rises into the air, the direction, and velocity of the ball are actually downward.

Learn more about kinetic energy here:

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The answer is c, because ball is falling so its gravitationl potential energy decreases, but it kinetic energy increases. Energy is always conserved.

Which one of the following statements about sulfuric acid is correct? A. Sulfuric acid is a known muriatic acid.
B. Sulfuric acid is a strong oxidizing agent.
C. Sulfuric acid is dangerous to living organisms.
D. Sulfuric acid has little effect on metals

Answers

The answer is C. Sulfuric Acid is dangerous to living organism

Direct contact with your skin and it will cause Chemical Burns , Direct contact with your eyes and it could cause a permanent Blindness.

This chemical also suck the water out of everything, so you can guess what will happen if it get into your body.

When two point charges are a distance d apart, the magnitude of the electrostatic force between them is F. If the distance between the point charges is increased to 3d, the magnitude of the electrostatic force between the two charges will be

Answers

Answer:

The magnitude of the electrostatic force decreases by a factor 9

Explanation:

The electrostatic force between two charges is given by:

$F=k(q_1 q_2)/(d^2)$

where

k is the Coulomb's constant

q1 and q2 are the two charges

d is the distance between the two charges

We see that the magnitude of the force is inversely proportional to the square of the distance. If the distance is increased to 3d: d' = 3d, the new electrostatic force would be:

$F'=k(q_1 q_2)/((d')^2)=k(q_1 q_2)/((3d)^2)=(1)/(9) k(q_1 q_2)/(d^2)=(F)/(9)$

So, the electrostatic force decreases by a factor 9.

Decreased by a factor of 9

If gravity did not affect the path of a horizontally thrown ball, the ball would ____.

Answers

If net force acting on the ball is zero(here if no gravitational force acts on the body), the ball will continue its motion in the same direction. Hope this helps.

Answer:

travel Horizontally

Explanation:

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