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Q1. A 35.0-kg child swings in a swing supported by two chains, each 2.90 m long. The tension in each chain at the lowest point is 352 N. Find the child's speeds at the lowest point.
Q2. The resistor in an RC circuit has a resistance of 150 Omega.
(a)What capacitance must be used in this circuit if the time constant is to be 3.7 ms?
(b)Using the capacitance determined in part (a), calculate the current in the circuit 7.4 ms after the switch is closed. Suppose that the capacitor is uncharged initially and that the emf of the battery is 9.0 V
A small block with a mass of 0.170 kg is attached to a cord passing through the hole in a frictionless, horizontal surface .The block is initially revolving at a distance of 0.50 m from the hole with a speed of 0.80 m/s. The cord is then pulled from ..
A generator uses a coil that has 210 turns and a 0.20-T magnetic field. The frequency of this generator is 60.0 Hz, and its emf has an rms value of 120 V. assume that each turn of the coil is a square (an approximation), conclude the length of wire f..
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A man pulls a crate of mass 75.0 kg across a level floor. He pulls with a force of 180.0 N at an angle of 26.0° above the horizontal. When the crate is moving, the frictional force between the floor and the crate has a magnitude of 130.0 N. If the cr..
An alpha particle (m = 6.7 ´ 10-27 kg, q = +3.2 ´ 10-19 C) has a speed of 20 km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle throughout this motion. Find out an electric potential difference V..
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