Peoples Physics Book Version-3

http://www.ck12.org Chapter 26. Answers to Selected Problems

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..