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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?
There is an 80 kg beam attached to a hinge on a wall and supported by the cord. The angle between the cord and the beam is 25 degrees. The beam is 4.5 m long., and cord is attached to the beam a metre from the beam's end. There is a 20 kg beam hangin..
Two people hear a tornado siren, What is the intensity level (in dB) at the farther listener relative to the other listener
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A homemade capacitor is assembled by placing two 10 in pie pans 11 cm apart and connecting them to the opposite terminals of a 9 V battery. Estimate the charge on each plate
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