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A car is designed to get its energy from a rotating flywheel (solid disk) with a radius of 1.00 m and a mass of 475 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 5,500 rev/min.
(a) Find the kinetic energy stored in the flywheel.
___________J
(b) If the flywheel is to supply energy to the car as a 20.0-hp motor would, find the length of time the car could run before the flywheel would have to be brought back up to speed.
____________ h
A 20.0 kg wagon is being pulled over a level driveway by a horizontally directed pulling force of 140 N. If there is a 100 N friction force opposing its motion, What is the forward acceleration of the wagon
An air parcel occupied by an ideal gas (T1 = 255 K, V1 = 1500m3, m1 = 1680 kg) collides and mixes with a second air parcel occupied by a second ideal gas (T2 = 280 K, V2 = 1200 m3, m2 = 1392 kg). Assuming the specific heat capacities of the gases ..
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Calculate how long it will take a ball to hit the ground if dropped from a height of 44 m,
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