Peoples Physics Book Version-2

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

2. 8.8 m/s


3. 39.5 m


4. 89 kW


5. 
   
   
   
   0. 4
   
   
   
   


6. 15.1 m/s


7. 43.8 m/s
   16..
   17..
   18..


8. 
   
   
   
   3. 15 × 105 J
   
   
   
   


9. 18.0 m/s


10. 2.41 m


11. 7900 J
    1.v 0 / 14
    2.mv 02 / 8


12. 7mv 02 / 392


13. 71%

Ch 9: Rotational Motion

1..

1. 
   
   
   
   9. 74 × 1037 kg m2
   
   
   
   


2. 
   
   
   
   1. 33 × 1047 kg m^2
   
   
   
   


3. 0.5 kg m^2


4. 0.28 kg m^2


5. 0.07 kg m^2


6. True, all rotate 2πfor 86,400; sec which is 24 hours,


7. True,ω= 2 π/t andt= 86 ,400 s


8. True,Lis the same
   4.L=IωandI= 2 /5 mr^2


9. True,K=^12 Iω^2 I= 2 /5 mr^2 sub−inK= 1 /5 mr^2 ω^2


10. True,K=^12 Iω^2 I=mr^2 sub−inK=^12 mr^2 ω^2


11. 250 rad


12. 40 rad


13. 25 rad/s


14. Force applied perpendicular to radius allowsα


15. 0.27 kg m^2 ,
    6.K^5 =84 J andK^10 =340 J
    2..


16. Moment of inertia at the end 1/3 ML^2 at the center 1/12 ML^2 , angular momentum,L=Iωand torque,τ=Iα
    change the in the same way
    4..


17. Lower


18. Iron ball
    
    
    1. 200 N team