Peoples Physics Book Version-2

http://www.ck12.org Chapter 29. Answers to Selected Problems Version 2

18. 2.3 m/s


19. 6 m


20. 1.4 seconds
    
    
    1. yes
    
    
    2. 14 m/s @ 23 degrees from horizontal
    
    
    
    


21. 22 m/s @ 62 degrees

Ch 5: Newton’s Laws

1..
2..
3..
4. Zero; weight of the hammer minus the air resistance.
5. 2 forces
6. 1 force
7. No
8. The towel’s inertia resists the acceleration

1. Same distance


2. You go farther


3. Same amount of force
   9..


4. 98 N


5. 98 N
   10..


6. 32 N


7. 5.7 m/s^2
   13..
   14..
   15.Fx=14 N,Fy=20 N


8. Left picture:F=23N 98◦, right picture:F=54 N 5◦


9. 3 m/s^2 east


10. 4 m/s^2 ; 22. 5 ◦NE


11. 
    
    
    
    0. 51
    
    
    
    


12. 
    
    
    
    0. 2
    
    
    
    


13. The rope will not break because his weight of 784 N is distributed between the two ropes.


14. Yes, because his weight of 784 N is greater than what the rope can hold.


15. Mass is 51 kg and weight is 82 N


16. While accelerating down


17. 686 N


18. 826 N


19. 390 N


20. 490 N


21. 
    
    
    
    0. 33
    
    
    
    


22. 3.6 kg


23. g sinθ


24. (b) 20 N (c) 4.9 N (d) 1.63 kg (e) Eraser would slip down the wall