Peoples Physics Book Version-2

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

19. (c) 1.5 units (d) 2/ 3


20. (c) 3 units (e)− 2 / 3


21. (c) 5.3 units
    22..


22. (b) 22.5 mm
    24..


23. 32 cm
    
    
    1. 
       
       
       
       10. 2 ◦
       
       
       
       
    
    
    2. 27 cm
    
    
    3. 20 cm
    
    
    
    


24. (a) 0.72 m
    27..


25. 54 cm,44 cm,21 cm, 8 .8 cm
    29..


26. 
    
    
    
    13. 5 ◦
    
    
    
    


27. 549 nm

Ch 18: Fluids

1. 
   
   
   
   0. 84
   
   
   
   


2. 
   
   
   
   1. 4 × 105 kg
   
   
   2. 90% of the berg is underwater
   
   
   3. 57%
   
   
   
   


3. (b) 5. 06 × 10 −^4 N (c) 7.05 m/s^2


4. 4.14 m/s


5. 
   
   
   
   6. 40 coins
   
   
   
   


6. (b) upward (c) 4.5 m/s^2 (d) Cooler air outside, so more initial buoyant force (e) Thin air at high altitudes
   weighs almost nothing, so little weight displaced.


7. (a) At a depth of 10 cm, the buoyant force is 2.9 N (d) The bottom of the cup is 3 cm in radius
   
   
   1. 83,000 Pa
   
   
   2. 104 N
   
   
   3. 110 N
   
   
   4. 248 kPa
   
   
   5. 591 kPa
   
   
   6. 1081 kPa
      8..
      9.. 0081
   
   
   7. 12500 J/m^3
   
   
   8. 184 kPa
   
   
   9. 1.16 kW
   
   
   10. 2.56 kW
   
   
   11. 11.8 A
   
   
   12. $12. 60
   
   
   13. 611 kPa
   
   
   14. 6 atm