Homework Help: Physics-check

Posted by Elisabeth on Wednesday, October 17, 2007 at 10:29am.

can you check my answers?

2.is more work required to bring a fully loaded truck up to a given speed, than the same truck lightly loaded? defend your answer?
-more work is required to bring a fully loaded truck up to a given speed because it is doing more work since it is fully loaded.

5. a cart gains energy as it rolls down a hill. what is the force that does the work?
-the force that does the work is the hill.

8. engergy of an object depends on the reference frame of the observer. explain why you agree or disagree? ( This one I dont understand)

10. you and a flight attendant toss a ball back and forth in an airplane flight. does the ke of the ball depend on the speed of the airplane?carfully explain your answer?
-i got that the ke does depend on the speed of the plane because the faster the plane, the faster the ball will go.

13. you watch your friend take off in a jet plane and you comment on the kinetic energy she has acquired. but she says she has no such increse in kinetic enegery. who is correct?
-i got that the friend was correct

Physics-check - bobpursley, Wednesday, October 17, 2007 at 11:19am
Your answers are somewhat shallow, If I were marking the paper, I would reward you for that.
2. You didnt answer it at all. Consider what makes up KEnergy. Which has more KEnergy, a light, or loaded truck. Did it take work to get to the KE?
5. What is gravity?
8. Energy is measured in reference to velocity or a position. Can you think of any counter examples?
10. KE in reference to what system? Do you sitting in your chair have KE? Isn't the chair rotating with the Earth?
13. Again, whose system of reference?

Try when explaining to focus on the causes of what is being observed. That is the essence of physics.

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