Physics 10154 - Homework #7
Due Mon Oct 29/Tue Oct 30
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 7
- #4
- Use mks units for this problem (rad/sec instead of rev/min). Answer with 3 SF.
- #6
- Same comment as with #4.
- #10
- There are 2 different parts to this problem with 2 different angular accelerations.
- #18
- Sum the forces at the bottom of the motion, including centrifugal force. This is similar to 22 and 54.
- #32
- Similar to 18, except the normal force exerted by the track takes the place of tension in part (a). In part (b), when the car is barely held to the track by gravity, what must the normal force be? Similar to 55.
- #34
- The constants you need for this are on page 223 of your book. Remember that the "r" in the force of gravity equation is the distance to the center of the object. "r" is equal to the radius of the planet plus the altitude above the planet's surface.
- #38
- If you set the forces equal to one another, and you know the distance to the Sun plus the distance to the Earth must add up to 1.496 x 10^11 meters, then you will have two equations and two unknowns. There is an algebraic trick to make this easier that I will show you if you ask about it in class.
- #42
- Use Kepler's 3rd Law. Remember the difference between "r" and altitude. For part (b), the book refers to "g", which should be smaller than 9.8 since the satellite is further from the center of the Earth than the surface.
- Suggested odd problems:
-
C2a C2b, C3,
C4, C5,
C6,
C8, C9,
C10, C11
C12, C13,
#1,
#2a #2b,
#3,
#5,
#7,
#8,
#9,
#11a #11b,
#12,
#13,
#14a #14b,
#15,
#16,
#17a #17b,
#19a #19b,
#21,
#22a #22b,
#23,
#24,
#25,
#27,
#31,
#33,
#35,
#36a #36b,
#37,
#40,
#41a #41b,
#43,
#44a #44b,
#46,
#47a #47b,
#51,
#53,
#54,
#55,
#57,
#66,
#70