A toaster receives 216,000 J of energy from the mains. 90,000 J of this is transferred as useful energy to the thermal energy stores of a bagel. What is the efficiency of the toaster? Give your answer as a percentage to the
nearest whole number.

The system is released from rest with the cable taut, and the homogeneous cylinder does not slip on the rough incline. determine the angular acceleration of the cylinder and the minimum coeffi cient s of friction for which the cylinder will not slip.