Homework Help: Physics

Posted by Jean on Thursday, March 1, 2007 at 6:09am.

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.

Forcedrag=k v
= .950kg/s * .09m/s= ? joules

I got this answer too.
but the book says the answer is 3.01 N up?

Total force required = Weight + drag = (4/3) pi R^3 * density * g
+ (0.950) kg/s * 9*10^-2 m/s

Use g = 9.8 m/s^2,
R = 2*10^-2 m,
and density = 8.92*10^3 kg/m^3

AHHH!
thank you SO much.
can i ask you how you got the
"weight" part of the equation?

Weight = Mass * g = Volume*density* g

The answer will be in Newtons, by the way

No one has answered this question yet.

Answer this Question

Related Questions

Physics - Calculate the force required to pull a copper ball of radius 2.00 cm ...
Physics please help - Calculate the force required to pull a copper ball of ...
PHYSICS!!! - The Venturi tube shown in the figure below may be used as a fluid ...
Physics - A 6.00 cm tall candle is placed at a distance of 30.0 cm from a double...
Physics - a) The coefficient of kinetic friction between a steel block and an ...
Physics - Can anyone answer part 3 for me? I've tried so many incorrect ...
Physics - 5. The ball launcher in a pinball machine has a spring that has a ...
physics - a kitten pushes a ball of yarn rolling toward it at 1.00 cm/s with its...
physics - A block of mass = 0.85 kg is connected to a spring of force constant...
physics - A block of mass = 0.85 kg is connected to a spring of force constant...

For Further Reading

First Name:
School Subject:
Answer: