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 2

#2

Convert to mks units before starting each part of this problem. Answer part (b) in years. Both parts require 2 SF in the answers.

#10

The distance to complete an entire orbit around the Earth is 2*(pi)*r where r is the distance from the center of the Earth (the radius of the circular orbit).

#14

I will provide hints for this one in class. There are a few ways to solve it. To get you started, try this: imagine from the perspective of runner A, you are at rest. How far away is runner B, and how fast is runner B moving relative to your perspective as runner A? How long will it take runner B to cover that distance?

#20

Watch signs on this one and keep them all consistent.

#28

Spread your work out on this problem. Solve it in pieces. The most common mistake on this problem is solving for the wrong number, which means making the wrong assumptions.

#30

Treat each part of the motion separately. The equations of constant acceleration only work if you consider time intervals during which the acceleration is truly constant (see the rocket problem on page 44 for example).

#36

Convert to mks units before starting this problem.

#44

This is very similar to problem #43, which we will solve in class.

#50

Make sure that your signs for displacement, velocity and acceleration are all consistent. To find the time, you may either use the quadratic formula in a single step, or to avoid the quadratic formula, solve for the final velocity first, then use that in a simpler equation to find t.

#66

Similar comment as for #50. To solve for the last part of the safe's motion, you will need the initial velocity of that last part, which is the final velocity from the first part of its motion (when it falls the first 15 meters).

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Suggested problems:

C1, C2, C3, C5, C6, C7 C10, C11, C15 C16, C17, #1, #3, #4, #5, #8, #9, #11, #13, #18, #19, #20, #21, #25, #26, #27, #29, #31, #32, #33, #34, #35, #37, #38, #39, #43, #45, #46, #47, #48, #49, #51, #54, #55, #56, #57, #58, #59, #60, #61, #70, #71