Final Exam Review Answer Key

Key, final exam review

1. look these up   

2. see lab work and HW for help  

3. -9.8m/s^2  

4. a) -2.5m/s  b) it is constant, -9.8m/s^2    c) 0.25sec   d) 0.32m     e, f, g) see lab from first semester

5. 131N

6a) 0.55sec   b)0.22m

7.a) see chapter 4, Free body and force diagrams   b) >98N

8. a) 225 Ns    b) 4.5m/s    c) 506 Joules

9.  1125N

10. a) 4.5m/s^2  b)0.63 s

11. 0.15 Joules

12. a)441Joules  b) 0.78 sec   c) 7.7 m/s   d) 441 Joules

13. a) 29.4N    b) 0N

14. a) 12N    b) kinetic    c) 0.4

15. a) 25.5N b) 14.7N  c) static
NOTE: if this is on the final, I'd include a diagram of the ramp and ramp equations.
16. a) m1v1’=-m2v2’   b) 0 Joules     c) -13 kg*s   d)50s
17. 77.6m  
(this problem will NOT be on the final IN THIS FORMAT- it combines about all of the physics of semester 1 to solve this- if you can solve it, you're going to ace the final.  If it is on the final, it'd be broken down into about 10 smaller questions... PE at top gives you total ME through out, then calculate force of friction and work done by Friction- note slope here, and work done by increasing PE by going UP small ramp, use that to find jump velocity, then this is a 2d kinematics question w/ horizontal and vertical velocity from ramp jump velocity at an angle... to determine that the skier lands 77.6m from the ramp.... phew.)