Suppose the car in Exercises 23 and 24 has stored 1.00 × 10² megajoules (MJ) of energy in its battery. Suppose the electric propulsion system of the car can convert 90. percent of that energy into mechanical power. Suppose the car requires 30. kW of mechanical power to travel at 33.5 miles per hour. How many miles can the car travel using the energy in its battery? (A: 28 miles)

Exercises 23 and 24

A hybrid car is an automobile that achieves high fuel efficiency by using a combination of thermal energy and electrical energy for propulsion. One of the ways it achieves high fuel efficiency is by regenerative braking. That is, every time the car stops, the regenerative braking system converts part of the TKE of the car into electrical energy, which is stored in a battery. That stored energy can later be used to propel the car. The remaining part of the TKE is lost as heat. Draw a control surface diagram showing the energy conversions that take place when the hybrid car stops. (A: See diagram below.)

Transcribed Image Text:

Electric Energy Heat Braking System Battery ΤKΕ Mass of Car