Question 5 of 20 Map A Sapling Learning macmillan learning A 0.954-kg toy car is

Question

Question 5 of 20 Map A Sapling Learning macmillan learning A 0.954-kg toy car is powered by two C cells (3.00 Vtotal) connected directly to a small DC motor. The car has an effective energy conversion efficiency of 52.6%, meaning that 52.6% of the electric energy applied to the motor is converted into translational kinetic energy. After 4.96 seconds, the car, which is initially at rest, reaches a speed of 2.35 m/s. What is the average current supplied to the car's motor? Number A Previous 3 Give Up & View Solution Check Answer Next Exit Hint

Explanation / Answer

m = 0.954 kg

efficiency = 0.526, v = 2.35 m/s

Kinetic energy = 1/2 m v2 = 0.5 * 0.954 * 2.352 = 2.63 J

Energy supplied = 2.63 / 0.526 = 5.00 J

The average power = 5.00 / 4.96 = 1.01 W

I = P / V = 1.01 / 3.00

I = 0.336 A

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