Kerrgulayaoviz
Answered

A grinder disc of mass 2.0 kg with 8.0 cm radius rotates at 500 rev/min. What is its rotational kinetic energy?

a. 8.8 J
b. 17 J
c. 26 J
d. 43 J

Sagot :

Kaizoku00viz
i think
k = mv^2/2
then
k =( 2kg/2)[(500rev/min)(2pie(0.08m)(1min/60sec)]^2
= 17.5 J i guess its B