Which combination of options is most accurate? (A) Mechanical energy is unaffect

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Which combination of options is most accurate? (A) Mechanical energy is unaffected by reversible interactions. (B) Source energy is ALWAYS changed by irreversible interactions. (C) Thermal energy is ALWAY involved in irreversible interactions. (D) A car burning fuel is an example of using up potential energy. (E) None of the above. Two carts collide elastically on a level track. Which combination of options is most accurate? (A) The mechanical energy before the collision is equal to the mechanical energy afterwards. (B) The kinetic energy before the collision is equal to the kinetic energy afterwards (C) The thermal energy increased during the collision. (D) The carts source energy is converted to kinetic energy during the collision. (E) None of the above. Which combination of statements is most accurate? (A) Mass is a measure of an object's resistance to speed. (B) Mass and weight are equivalent to each other. (C) Objects with the same mass must made of the same material. (D) Mass isn't necessarily conserved, but it cannot be created or destroyed. (E) None of the above Which combination of options is most accurate? (A) Momentum is conserved only when objects are not interacting with each other. (B) As a ball falls to the ground, its momentum increases, therefore is not conserved. (c) It is possible for an elephant and a mosquito to have equal amounts of momentum. (D) In an isolated, two-object collision, the impulses are equal and opposite. (E) None of the above A car accelerates from rest, reaches a comfortable cruising speed, and eventually slows down and comes to a stop. Assuming that the car's direction of motion is the positive direction, which combination of statements is most accurate? (A) The car's velocity-time graph is positively sloped, then zero sloped, and then negatively sloped. (B) The car's position time graph goes up and levels off, then heads back down. (C) The car's average velocity is non-zero. (D) The car's average acceleration is non-zero, (E) None of the above. Which combination of options is most accurate? (A) When you slow down, your velocity MUST become more negative. (B) Accelerating an object means it will speed up. (c) An increasing position-time graph implies positive acceleration. (D) Your velocity MAY point opposite to the direction in which you are moving. (E) None of the above.

Explanation / Answer

5) mechanical energy is uneffected by a reversible reactions

6) in a elestic collisions kinetic energy remains constant

7) option d

8) option a

9) option a

10) option d

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