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A large grindstone wheel ( a solid cylindrical disk made of stone) has a mass of 30 kg. and a radius of 50 cm. It is spinning at an angular rate of 90 rev./min. A brake is applied at the edge of the disk and pushed against it with a force of 25 newton. If the brake coefficient offriction is u=.65,
a) what is the torque acting on the wheel?
b) what is the angular acceleration of the wheel?
c) How many complete revolutions does it turn through before stopping?
A 1.5kg- block of ice is initially at a temperature of -7.0C a)If 2.6×10^5J of heat are added to the ice, Find the amount of ice, if any, that remains
A cylinder of solid material weight 10.5 kg i the air, and 9.00 kg when submerged in water and 3 kg when submerged in another liquid. determine the density of the cylinder
Suppose a radio station emits EM waves uniformly in all directions. What is the maximum power level of this radio station so as to avoid electrical breakdown of air at a distance of 2.0m from the antenna
4 kg of liquid seawater with initial temp 0 C and salinty 3 % is mixed with pure water with initital temp 15 C the system reaches equilibrium at 5 C
A uniform magnetic field points out of the page. The field fully penetrates a wire loop in the plane of the page. what is the averaged induced current
A pendulum hangs from an inclined wall. Suppose that this pendulum is released at an initial angle of 10 degrees and it bounces off the wall elastically when it reaches an angle of -5 degrees
A blow-dryer and a vacuum cleaner each operate with a voltage of 120 V. The current rating of the blow-dryer is 12 A, find the power consumed by the vacuum cleaner
You find a used battery and discover that it is no longer strong enough to power your CD player. What is the potential difference
A compact disk on a CD player rotates clockwise. The disk completes one revolution in 0.260 s. Find the angular velocity of the disk
A comet has a very elliptical orbit with a period of 116.1 y. what is its greatest distance from the Sun
A solar cell generates a potential difference of 0.95 V when a 380 ? external resistance is connected across it, What is the internal resistance of the solar cell
compute the diameter of the bright circular spot formed.
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