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When an object moves through a fluid, the fluid exerts a viscous force on the object that tends to slow it down. For a small sphere of radius R, moving slowly with a speed v, the magnitude of the viscous force is given by Stokes' law, F = 6??Rv, where ? is the viscosity of the fluid.
(a) What is the viscous force on a sphere of radius R = 4.90 10-4 m that is falling through water (? = 1.00 10-3 Pa · s) when the sphere has a speed of 3.4 m/s?
_____ N
(b) The speed of the falling sphere increases until the viscous force balances the weight of the sphere. Thereafter, no net force acts on the sphere, and it falls with a constant speed called the "terminal speed." If the sphere has a mass of 1.03 10-5 kg, what is its terminal speed?
_____ m/s
An 84 kg skier is being pulled by a boat with a force of 240 N causing the skier to accelerate at 1.4 m/s^2. Find out the drag force on the skier.
Fourteen moles of an ideal monatomic gas expand isothermally at a temperature of 75°C. what is the heat flow into the gas
A RC circuit is to be wired for testing using a 33 ohm resistor anda 100 mirco farad capacitor. The signal source is a squarewave generator, Calculate the expected time constant
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A block of wood with volume V floats in water with 0.65V submerged. In oil the block floats with 0.84V of its volume submerged
Consider a capacitor created when two identical conducting plates are placed parallel and close to each in other in vacuum, what is the magnitude of the electrostatic force between the charged plates, Is the force attractive or repulsive
A flight attendant pulls her 73 N flight bag a distance of 245 m along a level airport floor at a constant velocity. The force she exerts is 45 N at an angle of 54° above the horizontal.
At each point on the surface of the cube shown in Fig. 23-27, the electric field is parallel to the z axis. The length of each edge of the cube is 3.2 m. On the top face of the cube the electric field is in the negative z direction and has a magni..
A bicycle wheel of radius 0.4 m is spinning at a rate of 65 revolutions per minute. find the centripetal acceleration of a point on the edge of the wheel
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