Caine Physics

 AP Physics First Semester Exam Review Answers

1.  (1)Moving positive direction and speeding up, (2)  Maintain that speed, (3)  Slows to a stop and turns around and speeds up in the other direction.

2.  a. 53 m/s, b. 25 m/s,  c. a=12t

3.         t=1s : x=21.7 m   y=7.6 m    vx=21.7 m/s   vy=2.7 m/s   ax=0 m/s^2   ay=-9.8 m/s^2
           t=2 s : x=43.4 m   y=5.4 m    vx=21.7 m/s   vy=-7.1 m/s  ax=0 m/s^2   ay=-9.8 m/s^2
Top t=1.28 s : x=27.7 m   y=8.0 m    vx=21.7 m/s   vy= 0 m/s     ax=0 m/s^2   ay=-9.8 m/s^2

4.  a.  20.1 m/s     b.  x = 70.1 m         c.  52 m

1.  a= 1.23 m/s^2 down, either speeding up going down or slowing as it moves up.

2. a= 2.45 m/s^2, FAB = 36.75 N

3. a= 4.05 m/s^2

4.  FRP = 908 N

5. FCP = 1760 N

1.  a.  W= 300 J        b.  v= 4.56 m/s

2.  a.  h= 62.3 m    b.  W= - 61500 J

3.  a.  x= 0.163 m       b.  x= 0.99 m

4. F = -( 6r + 4/r^2)

5.  d= 2.04 m

1. a.  x = 0.89 m    b. v = -1 m/s for each block    c.  J = -20 kg m/s

2.  v = 12.0 m/s @ 41.6° +y of –x

3.  a.  v= 3 m/s     b.  Elastic