4 EASY QUESTION! EASY 300 Points! What is the correct statement about energy? A.

Question

4 EASY QUESTION! EASY 300 Points!

What is the correct statement about energy?

A.)Energy is destroyed when released.

B.)Energy can be transformed from one form to another.

C.)Energy cannot be transfered between objects

D.)All of these statements are correct with regard to energy.

When is the conservation of mechanical energy applicable? (May be more than 1)

A.)Only when the force of gravity is involved.

B.)When there are nonconservative forces on a system.

C.)When there is any force acting on a system.

D.)When there are conservative forces on a system.

A spring with a ball of mass m is compressed by a distance x so that, when released, the ball goes flying with velocity v. The spring constant is k. Which of these is the correct equation that expresses conservation of energy in this problem?

A.)mv2=kx/2

B.)mv2=kx2

C.)mv/2=kx2

D.)mv2/2=kx

An elevator mechanism can lift an elevator of mass m kg to a height of h meters in t seconds. Which equation would you use to calculate the power that the elevator mechanism generates?

A.)hg/mt

B.)mgh/t

C.)mt/hg

D.)mh/t

Explanation / Answer

1)
B.)Energy can be transformed from one form to another.




2) A.)Only when the force of gravity is involved.
D.)When there are conservative forces on a system.


3) B)m*v^2 = k*x^2


4)B) mgh/t

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