4.1 The mass of an electric car is 900 kg including the passengers. A single mo- tor mounted on the front wheels drives the car, and the radius of the wheel is 0.3 m. The car is going downhill at a speed of 50 km/hr, and the slope of the hill is 30°. The friction coefficient of the road surface at a given weather condition is 0.8. Ignore the motor losses and compute the power generated by the electric machine.
4.1 The mass of an electric car is 900 kg including the passengers. A single mo- tor mounted on the front wheels drives the car, and the radius of the wheel is 0.3 m. The car is going downhill at a speed of 50 km/hr, and the slope of the hill is 30°. The friction coefficient of the road surface at a given weather condition is 0.8. Ignore the motor losses and compute the power generated by the electric machine.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Transcribed Image Text:4.1 The mass of an electric car is 900 kg including the passengers. A single mo-
tor mounted on the front wheels drives the car, and the radius of the wheel
is 0.3 m. The car is going downhill at a speed of 50 km/hr, and the slope of
the hill is 30°. The friction coefficient of the road surface at a given weather
condition is 0.8. Ignore the motor losses and compute the power generated
by the electric machine.
4.2 Assume that the electric car in Problem 4.1 is moving at a constant speed. It
takes the car 1 min to reach the bottom of the hill. Calculate the energy gener-
ated by the electric machine.
4.3 If the energy generated by the electric machine in Problem 4.2 is totally con-
sumed by the batteries of the car, compute the charging rate of the batteries. Is
it possible to charge a battery pack at this rate?
4.4 The electric drive system shown in Figure 4.6 consists of a motor, a pulley, a rigid
belt, and a stage. The motor moves the stage in either direction. Explain the mo-
tion of system and the power flow using the four-quadrant drive concept.
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