PHYS124 Study Guide - Quiz Guide: Incandescent Light Bulb, Electrical Energy, Kilowatt Hour
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23 Nov 2017
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PHYS124 Full Course Notes
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Phys 124 assignment 4 work and energy. Read chapters 7 and 8 of walker"s physics textbook: the driver of a car of mass 1,500 kg travelling at 80 km/h suddenly sees a deer jump out in front of him. = 3. 7 105j. (b) without using the constant acceleration equations calculate the magnitude of the braking force. Work done by the force is equal to the change in the kinetic energy. Final kinetic energy is zero, since the nal speed is zero. W = f d = f 50m. W = k means that the braking force is. K = kf ki = 3. 7 105j. The force is negative since it opposes the motion. We are only interested in the initial power used to brake the car, so. = 1. 6 105w: electrical energy is typically sold in units of kilowatt-hours i. e. the amount of electricity used by a. 1kwh = 103w hour = 103 j s.