# Physics

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

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

1. 👍 0
2. 👎 1
3. 👁 1,323
1. fdv

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Physics

A chain composed of four identical links is suspended by a rope and does not move. How many force vectors would be drawn on the free body diagram of each link and which direction would they point? My answer: ---------- FIRST LINK

asked by Stanley on September 21, 2010
2. ### Physics helppp

Figure 5-53 shows a man sitting in a bosun's chair that dangles from a massless, frictionless pulley and back down to the mans's hand. The combined mass of man and chair is 94 kg. Fig. 5-53 With what force magnitude must the man

asked by Sam on July 14, 2010
3. ### Physics

A crowbar is used to pull a nail. The length of the effort arm of the crowbar is 26 cm and the resistance arm is 4.2 cm. What force in N is required to pull a nail if the friction force holding the nail in place is 120 N?

asked by mssailormouth on June 30, 2019
4. ### physics

A boy picks up a bowling ball. Which of the following choices correctly describes the interaction between the boy and the bowling ball? a.The boy exerts an upward force on the ball, and the bowling ball exerts a downward force on

asked by anon on September 27, 2019
5. ### Physics

A sphere of radius 10 cm is charged to a potential of 500V. Calculate the outward pull per unit area. Ans: 1390 * 10^-8 N/m^2 -------- I'm sure the calc is simple, but how do I calculate "outward pull" from voltage?

asked by Sean on December 24, 2009
1. ### Physics

A ball thrown by Ginger is moving upward through the air. Which force diagram represents the forces on the ball? You may neglect the effects of air resistance. a) only down force b) only up force c) both forces d) both forces (but

asked by Max on December 15, 2017
2. ### Chemistry

Copper has density of 8.94 and crystallizes with the face-centered cubic unit cell. Calculate the radius of a copper atom.

asked by amy on January 29, 2012
3. ### Physics

1)An alloy of copper zinc has a mass of 4.9kg.when suspended in water.0.98kg of water was displaced by it.calculate the mass of zinc in the alloy if 2.5 and 19.6 are the specific gravity of the zinc and copper respectively 2) A

asked by Skyboy on December 18, 2015
4. ### physics

a helicopter of mass m has an acceleration of magnitude 0.12 upward. a)determine the force required to cause this aaceleration? b) how much work is done by this force in moving the helicopter a distance deltay upward?

asked by samima sabah on October 31, 2010
5. ### Physics, van de graff generators...

When a small metal ball with a charge is placed in an electrical field supplie dby a van de graff generator, it experiences a force from the generator, and thus it applies a reaction force. But does the ball also apply a force met

asked by TJ on June 22, 2006