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A computer disk drive spins at 7200 rpm when a brief 30 second power outage occurs. During this time the drive slows down due to friction which provides a constant deceleration, and the drive makes exactly 2200 revolutions (but is not at rest).
A) What is the angular speed (in rad/s) of the drive when the power comes on, after 30s?
B) How much time would be needed for the drive to come to rest?
two skaters each of mass m are standing a slight distance apart on a nearly frictionless horizontal surface of ice
In outer space, far from other objects, block 1 of mass 30 kg is at position m, and block 2 of mass 1350 kg is at position m. What is the (vector) gravitational force acting on block 2 because of block 1? It helps to make a sketch of the situatio..
If there is turbulence inside the pipe, then the required pressure to force the water through is significantly higher, so this is to be avoided.
An electron and a proton have charges of an equal magnitude but opposite sign of 1.6 10-19 C. what are the magnitude and direction of the electrostatic force exerted on the electron by the proton
A railroad car of mass 3.3 104 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, How much kinetic energy is lost in the collision
A rocket of mass 4.5105 kg is in flight. Its thrust is directed at anangle of 50.5° above the horizontaland has a magnitude of 6.30 106 N. Find the magnitude and direction of the rockets acceleration. Give the direction as an angle above thehorizo..
A playground merry-go-round of radius R = 1.40 m has a moment of inertia I = 255 kg · m2 and is rotating at 9.0 rev/min about a frictionless vertical axle. What is the new angular speed of the merry-go-round
A 0.60 kg mass vibrates according to the equation where x is in meters and t is in seconds. find out (a) amplitude, (b) frequency, (c) total energy, and (d) kinetic energy and potential energies when x = 0.30 m.
an object of mass m = 6.0 kg hangs from a cord around a light pulley. The length of the cord between point P and the pulley is L = 2.0 m. What must be the linear mass density of the cord
An Electronic lift can raise a 216 kg mass a distance of 25.7 m in 5.0 seconds. What was the work done by the lift
A dedicated sports car enthusiast polishes the inside and outsidesurfaces of a hubcap that is a section of a sphere. When he looksinto one side of the hubcap, he sees an image of hisface 26.0 cm in back of the hubcap.
A cart of mass 6.8 kg is moving with a velocity of 15.2 m/s. It makes a head-on perfectly inelastic collision with a stationary cart B with mass 6.4 kg causing them to travel with the velocity 7.63 m/s. What is the velocity of cart B.
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