Peoples Physics Book Version-2

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

29.1 Appendix A: Answers to Selected Prob-

lems (3e)

Ch 1: Units and Problem Solving

1. 
   
   
   
   1. A person of height 5 ft. 11 in. is 1.80 m tall
   
   
   2. The same person is 180 cm
   
   
   3. 3 seconds= 1 /1200 hours
   
   
   4. 3x 103 ms
   
   
   
   


2. 87.5 mi/hr


3. (c) if the person weighs 150 lb. this is equivalent to 668 N


4. Pascals (Pa), which equals N/m^2


5. 168 lb., 76 .2 kg


6. 5 mi/hr/s


7. 15.13 m


8. 11.85 m


9. 89,300 mm


10. (f) 2025 mm^2


11. (b) 196 cm^2


12. (c) 250 cm^3


13. 8 : 1,each side goes up by 2 cm, so it will change by 2^3


14. 
    
    
    
    3. 5 × 1051 : 1
    
    
    
    


15. 72,000 km/h


16. 0.75 kg/s


17. 8× 2 Ncm^3 /sec;Nis for each second starting with 0 seconds for 8 cm^3


18. About 12 million


19. About 1^12 trillion( 1. 5 × 1012 )
    20.[a] =N/kg=m/s^2

Ch 2: Energy Conservation

1. d


2. (discuss in class)
   
   
   1. 
      
      
      
      5. 0 × 105 J
      
      
      
      
   
   
   2. 
      
      
      
      3. 7 × 105 J
      
      
      
      
   
   
   3. Chemical bonds in the food.
   
   
   4. 99 m/s
   
   
   5. 
      
      
      
      5. 0 × 105 J
      
      
      
      
   
   
   6. 108 m/s
   
   
   7. 450,000 J
   
   
   8. 22,500 J