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 wheelis 0.3 m. The car is going downhill at a speed of 50 km/hr, and the slope ofthe hill is 30°. The friction coefficient of the road surface at a given weathercondition is 0.8. Ignore the motor losses and compute the power generatedby the electric machine.4.2 Assume that the electric car in Problem 4.1 is moving at a constant speed. Ittakes 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. Isit 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 rigidbelt, 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.

According to guideline we need to slove only first question. According to question Given m=900kg,…

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.

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter7: Work And Kinetic Energy

Section: Chapter Questions

Problem 76P: Calculate the power output needed for a 950-kg car to climb a 2.00 slope at a constant 30.0 m/s...

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