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Constants
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1) A CD disk is reputed to accelerate from 0 to
- rpm in 2 seconds. What is its acceleration to the nearest radian/sec^2
2) In problem 1 how many radians does it turn through in the 2 seconds (to the nearest radian)?
3) A
kg disk with a radius of.5 meters is rotating at 400-rpm. What is its angular momentum to the nearest tenth of a Joule*sec?
4) What is the kinetic energy of the disk in problem 3) to the nearest tenth of a Joule?
5) A .5 meter diameter disk is freely rotating at
rpm and a initially nonrotating identical disk is dropped on it and sticks to it. To the nearest tenth of a radian/sec what is the angular velocity of the combination?
6) If the disks in problem 5) have a mass of 8 kg each, to the nearest tenth of a joule what is the final kinetic energy of the combination?
7) Four Masses are arranged in a square one meter on a side as follows: (clockwise starting in the upper lefthand corner): 7 kg ,2 kg ,
kg ,1 kg. What is the rotational inertia, to the nearest tenth of a kgm^2 ,about an axis perpendicular to the square and through the 1 kg mass?
8) What be the rotational inertia of the masses in problem 7) about an axis through the center of the square (to the nearest 2 decimal places)?
9) A torgue of
N-m is applied to a 8 kg disk with a diameter of .5 meters. What is the angular accceleration of the disk to the nearest radian/sec^2?
10) In problem 9, if the disk starts rotating from rest , to the nearest Joule what is its Kinetic Energy after 10 seconds?