Homework Help: physics

Posted by Mei Lei on Friday, August 19, 2011 at 12:35am.

1. You slowly lift a book of mass 2 kg at a constant velocity a distance of 3 m. How much work did you do on the book?

I got 180 for this

2. A 15 kg crate is moved along a horizontal floor with a rope that makes a 30 degree angle with the horizontal. If the tension in the rope is 200 N and the crate is slid 10 meters, how much work has been done on the crate?

3. True or False: An object that is motionless has no energy

4. What is the kinetic energy of a ball of mass .1 kg traveling at a speed of 160 m/s?

5. Assuming air resistance is zero (negligible), how high up would a .06 kg tennis ball travel if hit straight into the air at initial speed of 50 m/s?

6. A stunt woman scales a 40 meter high cliff. What is her potential energy due to gravity relative to the ground?

7. Imagine you are 100 kg and standing at the edge of a hole that goes to the center of the earth. What is your potential energy relative to the center of the earth?

physics (1) - drwls, Friday, August 19, 2011 at 9:03am
1. The work done is W = M g H
H is the distance it is lifted
Try again

You need to review the definitions of potential and kinetic energy and make an effort on the other questions.

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