FULL SCREEN PRINTERV RSION ·BACK Chapter 09, Problem 51 2 Your answer is partill

Question

FULL SCREEN PRINTERV RSION ·BACK Chapter 09, Problem 51 2 Your answer is partilly correct. Try again. A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotating flywheels provide a means for storing energy in the form of rotational kinetic energy and are being considered as a possible alternative to batteries in electric cars. The gasoline burned in a 154-mile trip in a typical midsize car produces about 1.73 × 109 J of energy. How fast would a 18.2-kg flywheel with a radius of 0.343 m have to rotate to store this much energy? Give your answer in rev/min. rev/min the tolerance is +/-296 the toler Click if you would like to Show Work for this question: Open Show Worlk

Explanation / Answer

mass of wheel = m = 18.2 kg

radius = r = 0.343 m

moment of inertia = I = 1/2 m* r^2 = 0.5 * 18.2 * 0.343^2 = 1. 07 kg - m^2

energy = 1.73x10^9 joules

1/2 I w^2 = 1.73 x10^9

w = 5.69 x10^4 rad/sec = 56900 x 30/ pie =543630. 57 rev/ min

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