Peoples Physics Book Version-3

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

2. Leonora’s


3. 617 J


4. 19.8 m/s


5. 8.8 m/s


6. 39.5 m


7. 89 kW


8. 
   
   
   
   0. 4
   
   
   
   


9. 15.1 m/s


10. 43.8 m/s
    15..
    16..
    17..


11. 
    
    
    
    3. 15 × 105 J
    
    
    
    


12. 18.0 m/s


13. 2.41 m


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


15. 7mv 02 / 392


16. 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. a. True, all rotate 2πfor 86,400; sec which is 24 hours, b. True,ω= 2 π/t andt= 86 ,400 s f. True,Lis the
   same g.L=IωandI= 2 /5 mr^2 h. True,K=^12 Iω^2 I= 2 /5 mr^2 sub−inK= 1 /5 mr^2 ω^2 i. True,K=^12 Iω^2
   I=mr^2 sub−inK=^12 mr^2 ω^2
   
   
   1. 250 rad
   
   
   2. 40 rad
   
   
   3. 25 rad/s
   
   
   4. Force applied perpendicular to radius allowsα
   
   
   5. 0.27 kg m^2 ,
      6.K^5 =84 J andK^10 =340 J
      3..
   
   
   
   


7. 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
   5..


8. Lower


9. Iron ball
   
   
   1. 200 N team