The original Bridge of Lionsdrawbridge in St. Augustine, Florida, was a roller-bascule design. The bascule, or movable leaf, was opened by rolling along its circular base in response to a horizontal force produced by a motor-driven wormscrew mechanism. a) If it is known that the motor shaft experienced a torque of 575 lb. in while rotating at 1100 rpm during a bridge opening, what was the minimum horsepower required for the motor

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.

How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?