The crane shown in the drawing is lifting a 186-kg crate upward with an acceleration of 2.0 m/s2. The cable from the crate passes over a solid cylindrical pulley at the top of the boom. The pulley has a mass of 130 kg. The cable is then wound onto a hollow cylindrical drum that is mounted on the deck of the crane. The mass of the drum is 150 kg, and its radius is 0.76 m. The engine applies a counterclockwise torque to the drum in order to wind up the cable. What is the magnitude of this torque? Ignore the mass of the cable.
torque= I*angular acceleration
angular accel= accel/r
The Attempt at a Solution
I tried everything that i know
angular accel= 2/.76 =2.6316 rad/s^2
torque= 86.64*2.6316= 228 N*m
But this answer is wrong. I tried negitive and thats wrong. What am I doing wrong! lol.