Recent content by em3

Homework Statement A solid disk of diameter equal to 500 mm and a mass of 60 kg is to be used as a flywheel in an energy recovery device. Determine the torque required to accelerate the rotation of the flywheel, about its axis, from rest to 250 rpm in 6 revolutions. Homework Equations [/B]...

Oh ok thanks, I got it. Thanks a lot!

How do I find that? The question only gives me the diameter and length, no inner or outer diameter.

40mm. and is 750mm into m, 0.04m and 0.75m. Then did A=2πrL+2πr2 2 * ∏ * 0.02 * 0.75 + 2∏0.022≈ 0.097 Sorry, made a typo in first post

Homework Statement An Aluminium rod has a diameter of 40mm. and is 750mm long. If the temperature difference between the ends of the rod is 100C . Take the thermal conductivity of Aluminium to be 235 Wm-1K-1 Homework Equations k * A * ΔT / L The Attempt at a Solution 235 * 0.097 m * 100 /...