Acarnot engine is operated between two heat reservoirs at temperatures of 520 k and 300 k. it receives heat from the 520 k reservoir and discards heat to the 300 k reservoir in each cycle. what is the thermal efficiency of the engine?

An electric motor is used to drive a power press which makes steel turning moment diagrams 323 pressings from a metal sheet. the motor runs at a mean speed of 50 rev/s. the torque required is 10.0nm for 0.2s, followed by 1.0nm for0.3 s with this sequence then being repeated. what is the minimum power required of the motor and the moment of incrtia required for the t1ywhcel if the speed fluctuations are to be restricted to 1.5%?