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Flywheels are large, massive wheels used to store energy. They can be spun up slowly, and then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 1.5 meter diameter and a mass of 250 kilogram. Its maximum angular velocity is 1200 rpm.
A motor spins up the flywheel with a constant torque of 50 N x m. Find how long does it take the flywheel to reach top speed?
A block with mass m1 = 9.4 kg is on an incline with an angle ? = 24.0° with respect to the horizontal. For the first question there is no friction, but for the rest of this problem the coefficients of friction are: ?k = 0.23 and ?s = 0.253. * When th..
A 54-kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.7 m/s, determine her altitude as she crosses the bar
an axon is the relatively long tail-like part of a neuron or nerve cell. the outer surface of the axon membrane
Suppose that two carts, one twice as massive as the other, fly apart when the compressed spring that joins them is released. How fast does the heavier cart roll compared with lighter cart
A 30 gram bullet initially traveling at 500 m/s penetrates 12 cm into a wooden block. Use Work Energy theorem and find the average force it exerts on the wooden block
a what is the direction of the force that you exert on the coin during the toss but before the coin leaves your hand?b
a cylinder that has a 40.0-cm radius and is 50.0 cm deep is filled with air at 20.08c and 1.00 atm. a 20.0-kg piston is
The far point of a nearsighted person is 5.1 m from her eyes, and she wears contacts that enable her to see distant objects clearly. How high is the image formed by the contacts
As seen from the window of a space station, a 99.0 kg satellite sailing along at 9.4 m/s collides head-on with a small 286.0 kg asteroid, What is the final velocity of the satellite
A disk 7.96 cm in radius rotates at a constant rate of 1 150 rev/min about its central axis. Determine the radial acceleration of a point on the rim
The light shining on a diffraction grating has a wavelength of 490 nm (in vacuum). How many lines per centimeter does the grating have
A uniform electric field exists between two parallel plates separated by 2.0cm. What is the potential difference between the plates
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