Question

a grinding wheel of mass 5.0kg and diameter 0.4 m is rotating with an angular speed of 2 rev S-1,calculate the torque which will increase its angular speed to 8 revolution per second in 2s.r

Answer 1

application of Newton's second law of motion in rotational motion

Answer 2

Hey people,

Mass m= 5.0 kg

Torque  τ= Change in angular momentum/time taken

τ= I *(ω₂-ω₁)/t

Torque= 5*(0.2)²*(16π-4π)/2

Torque= 3.6 N-m

Hope, this helps :)