PRINTER VERSION BACK NEXT Chapter 09, Problem 51 Your answer is partially correc

Question

PRINTER VERSION BACK NEXT Chapter 09, Problem 51 Your answer is partially 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 185-mile trip in a typical midsize car produces about 2.34 x 109J of energy. How fast would a 25.7-kg flywheel with a radius of 0.217 m have to rotate to store this much energy? Give your answer in rev/min. Number40970.99 Units rev/min the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work

Explanation / Answer

Moment of inertia of flywheel=mr2/2

= 0.5*25.7*0.217^2

=0.60509 kgm2

Kinetic energy of wheel=0.5I2=2.34*109

Solving for ,

=87945.36 rad/s= 839816 rpm

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

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