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A circular disk of mass 10.0 kg and radius 0.500 m rotates at 30.0 revolutions per second on a vertical axle, in the direction clockwise when viewed from above. Below it is a 30.0 kg disk of the same radius that is rotating 30.0 revolutions per second, but in the opposite (counterclockwise) direction. The upper disk is then allowed to drop onto the lower and, after friction forces have acted the two rotate together as a single disk of mass 40.0 kg.
(a) What is the final angular velocity of the combination of disks?
(b) What fraction of the initial kinetic energy of the system of two disks is lost in this interaction?
Suppose a 61 kg boy and a 43 kg girl use a mass less rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
Discover new angles with respect to the x-axis
A standard baseball has a circumference of approximately 23 cm. If a baseball had the same mass per unit volume as a neutron or a proton, about what would its mass be?
An electric scooter has a battery capable of supplying 140 Wh of energy. If friction forces and other losses account for 60 percent of the energy usage, what altitude change can a rider achieve while driving in hilly terrain, if the rider and scooter..
If a violin string transmits waves at 375 m/s and has 295 Hz as its fundamental frequency, what is the string's length.
A 0.10g honeybee acquires a charge of 25pCwhile flying, What is the ratio of the electric force on the bee to the bee's weight
two infinite, parallel planes have excess charge densitites o and -2o, what are the magnitude and direction of the electic field between the planes
Illustrate when is velocity of the boulder zero? Illustrate what is the magnitude of the acceleration while the boulder is moving? What is the direction of the acceleration while the boulder is moving?
What is the strength of an electric field at a distance r from the center, inside the sphere. Assume the sling thrower could gradually increase the speed of the stone.
The magnetic field in an electromagnetic wave has a peak value given by B = 3.3uT. Find the peak intensity. Find average intensity
It continues to fly along the same horizontal arc, but increases its speed at the rate of 1.10 m/s2. Find the acceleration in this situation at the moment the hawk's speed is 4.25 m/s. Find out the magnitude and direction (degrees)
Two unequal point charges q1 and q2 are held in place unconnected from each other. A point charge Q is placed somewhere between them at a point where it remains stationary when free. From this observation, we can conclude that q1 and q2 must eithe..
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