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A ball has a diameter of 3.72 cm and average density of 0.0838 g/cm3. What force is required to hold it completely submerged under water?
magnitude
N
direction


Sagot :

Step-by-step explanation:

Volume = 4/3 pi r^3 = 215.634 cm^3

mass = volume * density = 18.07 grams

Assuming freshwater at 1 gm / cc

the ball will displace 215.634 cc and experience a net buoyancy force

equivalent to  215.634 gm - 18.07 gm = 197.6 grams  

          which is  in newtons =  mg  

                      newtons = .1976 kg * 9.81 m/s^2 = 1.94 N