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The Physics of Answers

mathgeek15

Entry posted by mathgeek15

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Ok, I have been working really hard to finish the AP Physics Review Packet, but I haven't really compared answers with anyone else. So I thought it would be helpful for everyone if I posted my answers. I personally think they are right, but if you have a different answer, SAY SO!!! I would gladly compare notes to find the correct answer, helping everyone out. If I missed any questions, let me know.

[TABLE="class: grid, width: 500"]

[TR]

[TD]Pg 1

1. A

11. B

[/TD]

[TD]Pg 2

14. A

15. E

2. E

65. C

5. C

[/TD]

[TD]Pg 3

1. E

3. D

3 (below). C

[/TD]

[/TR]

[TR]

[TD]Pg 4

5. C

19. D

[/TD]

[TD]Pg 5

2. E

26. C

27. C

10. C

[/TD]

[TD]Pg 6

25. B

7. E

3. D

[/TD]

[/TR]

[TR]

[TD]Pg 7

6. E

9. E

5. C

[/TD]

[TD]Pg 8

19. A

9. D

[/TD]

[TD]Pg 9

34. B

4. E

7. E

[/TD]

[/TR]

[TR]

[TD]Pg 10

34. A

14. C

6. B

[/TD]

[TD]Pg 11

15. E

17. A

8. B

10. E

[/TD]

[TD]Pg 12

18. A

32. B

15. E

[/TD]

[/TR]

[TR]

[TD]Pg 13

18. D

16. A

18 (Right). B

[/TD]

[TD]Pg 14

19. C

8. A

13. A

14. A

[/TD]

[TD]Pg 15

31. E

17. B

12. C

17 (Right). E

[/TD]

[/TR]

[TR]

[TD]Pg 16

29. B

31. E

[/TD]

[TD]Pg 17

6. A

28. D

12. C

13. D

[/TD]

[TD]Pg 18

20. C

27. A

29. B

30. E

[/TD]

[/TR]

[TR]

[TD]Pg 19

23. D

1. D

5. C

[/TD]

[TD]Pg 20

14. B

15. A

9. D

35. A

[/TD]

[TD]Pg 21

32. E

33. B

32 (Right). D

35. E

[/TD]

[/TR]

[TR]

[TD]Pg 22

30. B

26. D

26 (Bottom). E

[/TD]

[TD]Pg 23

10. A

11. D

12. B

12 (Top). E

20. D

[/TD]

[TD]Pg 24

32. A?

22. C

21. C

[/TD]

[/TR]

[TR]

[TD]Pg 25

22. D

11. E

20. A

35. B

[/TD]

[TD]Pg 26

10. E

3. C

30. A

34. C

9. D

[/TD]

[TD][/TD]

[/TR]

[/TABLE]

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2 Comments

Recommended Comments

AlphaGeek

AlphaGeek 16

Posted

Thank you SO much for posting these. I caught at least 5 silly mistakes in my packet. If we didn't match, I'd do the problem again. There are still a few that I got different answers for, if you have no idea where I'm coming from I can post the work up..

Missing: pg. 1 #1, on the left (I got D)

Differing answers:

pg. 15 # 17: I know for sure this one is B. If you break the system into momentum in the Y direction and momentum in the X direction, the Py cancels out and Px becomes Vo/2. The reason why it doesn't work when you just use the original vectors is because one is going partly in the negative y direction and the other in the positive y direction, while both are going in the positive X direction.

Posted the soln. here because the pic wouldn't upload:

http://riverstreak.deviantart.com/art/0123132047-350197212?ga_submit_new=10%253A1358992645

pg. 20 # 14 I remember you explaining 14 and 15, but I can't think of how you got 14 for the life of me! I got C...

pg. 24 # 32 I got B..

Iw1 = Iw2

w1=w2

V1/ R1 = V2 / R2

V2 = V1 (R2/R1​)

And if anyone knows how to do the center of mass by picture, I would totally LOVE an explanation! (pg. 16 # 29)

mathgeek15

mathgeek15 12

Posted

ok. pg 1 #1. I'm pretty sure its A because its at constant acceleration, NOT constant velocity, so you need to use x= vo+ .5at2, which proves D wrong. And when you think about A, what its really saying is speed is increase 9.8 m/s per sec, aka accelerating 9.8 m/s2

pg 15 #17: yeah youre right i figured that out on the webassign

Pg 16 #29: Correction: B. PS: You do realize I can explain this?

YCM=[m(.5L) +m(.5L) +m(0)]/ 3m --> (1/3)(2/2L)--> L/3

Pg 20 #14: centripital force is equal to the spring force: F=kx --> F= (100)(.03) --> F=3 I know this is right.

Pg 24 #32: That's a tough call. You used L= Iw while I used L= mvr. Both are correct equations I believe, because i use mine all the time and it works. So well need another perspective...

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