Physics problem to solve

label Physics
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schedule 1 Day
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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.

Oct 8th, 2015

Thank you for the opportunity to help you with your question!

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=0.0855N
weight = 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.

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 8th, 2015

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