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Delivery trucks that operate by making use of energy stored in a rotating flywheel have been used in Europe. The trucks are charged by using an electric motor to get the flywheel up to its top speed of 200? rad/s. One such flywheel is a solid, uniform cylinder with a mass of 650 kg and a radius of 1.5 m.
(a) What is the kinetic energy of the flywheel after charging?
J
(b) If the truck operates with an average power requirement of 7.0 kW, for how many minutes can it operate between chargings?
min
A spherical surface completely surrounds a collection of charges. Find the electric flux (with its sign) through the surface if the collection consists of (a) a single +1.90 × 10-6 C charge, (b) a single -2.40 × 10-6 C charge, and (c) both of the ..
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