Posted by sara on .
A ball of circumference 71.5 cm and mass 640 g is forced to the bottom of a swimming pool and then released. After initially accelerating upward, it rises at a constant velocity. (The density of water is 103 kg/m3.)
(a) Calculate the buoyant force on the ball.

physics 
bobpursley,
densityball=mass/volume=.640kg/(4/3 PI r^3)
where radius r= .715/2PI
bouyant force: (mass displaced watermassball)g
= volume(densitywaterdensityball)g
= volume (density water)g  massball*g
= you finish it. Keep units in SI: kg, m^3 
physics 
sara,
this gives me the answer for drag force

physics 
Mike,
What would the equation for the drag force the ball experiences while it is moving upward at constant velocity be?