A man is riding his bike. The man weighs 150 pounds and the bike weighs 25 pound

Question

A man is riding his bike. The man weighs 150 pounds and the bike weighs 25 pounds.

Does the bike or the man have more motion energy (kinetic energy) and why? The bike has more motion energy than the man because the man is giving the bike his energy. The man has more motion energy than the bike because the man has energy but the bike does not. The man has more motion energy than the bike because the man weighs more than the bike. The bike and the man have the same amount of motion energy because they are traveling at the same speed.


Do all things have thermal energy? Why or why not? Do all things have thermal energy? Why or why not? Do all things have thermal energy? Why or why not? Do all things have thermal energy? Why or why not? A) The bike has more motion energy than the man because the man is giving the bike his energy. B) The man has more motion energy than the bike because the man has energy but the bike does not. C) The man has more motion energy than the bike because the man weighs more than the bike. D) The bike and the man have the same amount of motion energy because they are traveling at the same speed.

Explanation / Answer

1) C. Because the formula for kinetic energy is 1/2 m v^2 andalthough the bike and the man have the same velocity the man isgoing to have a higher kinetic energy because he has moremass 2) B. Thermal energy is the result of the kinetic energy of atomsand molecules. So when the atoms are moving the object has thermalenergy. The only time an object would not have thermal energyis if the object's temperature was at absolute zero and then theatoms would stop moving. But since this is impossible toacheive everything has thermal energy 2) B. Thermal energy is the result of the kinetic energy of atomsand molecules. So when the atoms are moving the object has thermalenergy. The only time an object would not have thermal energyis if the object's temperature was at absolute zero and then theatoms would stop moving. But since this is impossible toacheive everything has thermal energy 3) A. The formula for potentail energy is mgh so therefore thehigher an object the more potential energy it will have. And thecoconut is at its highest point before it starts to fall, sotherefore that is where it will have the highes potentialenergy. 3) A. The formula for potentail energy is mgh so therefore thehigher an object the more potential energy it will have. And thecoconut is at its highest point before it starts to fall, sotherefore that is where it will have the highes potentialenergy.

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