Question

the blade of a lawn mower is a 4.25 kg. 74.5 cm long metal (with a shape similar to a meter stick) with a hole at its midpoint. The blade is attached to the engine axle by a bolt through the center hole. when started, the blade accelerates to the full speed at 375 rpm in 5.25 seconds.

a) what is the angular acceleration of the blade?

b) how fast is blade edge moving 2.55 s after it start?

c) how much torque does the engine exert on the table?

Answer 1