A winch takes 11.5 seconds to lift a 1.23 kilogram piece of metal 1.85 meters vertically. The power supply for the winch is set at 12.5 Volts and it shows 1.15 Amperes of current being used. What is the efficiency, in percent, of the system? ASAP PLS

Burgers vector is generally parallel to the dislocation line. a)-true b)-false

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.

Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way