Calculate the force required to pull a copper ball of radius 2.00 cm upward through a fluid at the constant
speed 9.00 cm/s. Take the drag force to be proportional to the speed, with proportionality constant 0.950 kg/s.
Ignore the buoyant force.
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Density of copper is 8.92 gm/cm3
m = 8.92 *4/3*pi*(2)^3 = 298 gm = 0.298 kg drag force =f = 0.950*0.09=0.0855Nweight = mg = 0.298 *9.8 = 2.9204 N Net downward force = weight + drag force F = 0.0855+2.9204 =3.0059
this force is required to pull the copper ball.
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