A flywheel is a solid disk that rotates about an axis that is perpendicular to t

Question

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 367-mile trip in a typical midsize car produces about 4.48 x 109 J of energy. How fast would a 31.8-kg flywheel with a radius of 0.556 m have to rotate to store this much energy? Give your answer in rev/min.

Explanation / Answer

I = ½m*r² = 8.745 kgm²

E = ½Iw² w = [2E/I] = [2*4.48E9/8.745]

w = 32009.1 rad/sec

rpm = w*[60/2] =305664.8rev/min

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.