Peoples Physics Book Version-2

29.1. Appendix A: Answers to Selected Problems (3e) http://www.ck12.org

2. 40 N

3. 0.02 rad/s^2


4. 25 s


5. Coin with the hole


6. Coin with the hole


7. weight


8. 19.6 N


9. plank’s length( 0 .8m)left of the pivot


10. 15.7 N m,


11. Ba. weight, Bb. 14.7 N, Bc. plank’s length( 0 .3m)left of the pivot, Bd. 4.4 N m, Ca. weight, Cb.
    13 .6 N, Cc. plank’s length( 1 .00 m)right of the pivot, Cd. 13.6 N m, f) 6.5 N m CC, g) no, net torque
    doesn’t equal zero


12. 
    
    
    
    7. 27 × 10 −^6 Hz
    
    
    
    


13. 7.27 Hz


14. 100 Hz


15. 
    
    
    
    1. 25 × 105 J
    
    
    
    


16. 2500 J−s


17. 12,500 m−N


18. 28 rev/sec


19. 2300 N


20. (b) 771 N,1030 N (c) 554 kgm^2 (d) 4.81rad/sec^2


21. 300 N


22. 240N,−22 N
    3.. 092


23. 2280 N


24. 856 n toward beam, 106 N down


25. 425 kgm^2


26. 3.39 rad/sec^2
    1.− 1 .28 Nm


27. CCW


28. (a) 1411 kg (c) 17410 N (d) angular acc goes down as arm moves to vertical

Ch 10: Simple Harmonic Motion

1. 
   
   
   
   1. Buoyant force and gravity
      2.T=6 s,f= 1 /6 Hz
   
   
   2. 
      
      
      
      9. 8 × 105 N/m
      
      
      
      
   
   
   3. 0.5 mm
   
   
   4. 22 Hz, no,
   
   
   
   


2. 
   
   
   
   3. 2 × 103 N/m
   
   
   
   


3. (a) 110 N/m (d)v(t) = ( 25 )cos(83t)
   4..
   5..