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An electric motor can accelerate aFerris wheel of moment ofinertia I = 20000 kg·m2 fromrest to 9.7 rev/min in 12.0 s. When the motor is turnedoff, friction causes the wheel to slow downfrom 9.7 to 7.7 rev/min in 10.0 s.
(a) Determine the torque generated by the motor to bring the wheel to 9.7 rev/min.
(b) Determine the power thatwould be needed to maintain this rotational speed.
A sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere.
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
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