Solve the following problems on your own paper. Please:

• Show all work.
• Put a box around your final answer to each problem.
• Be sure proper significant figures (SF) used for all answers.
• Separate all solutions with a horizontal line on your paper.
• A random selection of four even problems will be graded for 25 points each.
• Solutions for suggested odd problems can be seen by following links.
• Solutions for even problems will be linked from this page after the due date.

Chapter 5

#6

Answer in Joules with 3 SF.

#8

For part (d), remember that the work done by the net force is equal to the sum of the works done by each individual force.

#12

Answer each part with 3 SF.

#18

The only force doing work here is the force of kinetic friction. Use 2 SF for your answer.

#28

Gravity is the only force doing work in this problem.

#32

Only gravity does any net work in this problem. The tension in each end of each rope does work, but that cancels out. This can also be solved with chapter 4 techniques, but it takes longer.

#42

#31 has a similar pendulum-style geometry. You need to find the change in height during the motion of the child as he swings from his highest to his lowest point. For (b), compare the work done by gravity to the change in kinetic energy. They aren't equal like in (a). The difference is the work done by friction.

#46

You can either use equation 5.21 or the Work-Energy theorem to solve this. I recommend the Work-Energy theorem. Answer with 2 SF.

#48

Answer with 2 SF.

#60

You can either use conservation of mechanical energy or the Work-Energy theorem here.

#64

Sum the work done by all the forces on block A: tension, gravity, friction and the normal force. Answer with 2 SF. If you don't want to use Chapter 4 methods to find the tension, you can use equation 5-15 analysis instead if you consider both mass simultaneously.

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Suggested problems:

C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, #1, #2, #3, #4, #5, #7, #9, #10, #11, #13, #14, #15, #16, #17, #19, #21, #22, #23, #24, #25, #26, #27, #29, #30, #31, #33, #34, #35, #36, #37, #38, #39, #40, #41, #43, #45, #48, #49, #50, #51, #53, #54, #58, #59, #62, #63, #68, #69, #70