### Determine the resistance

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##### Reference no: EM13949547

1. A 0.15-m-diameter pulley turns a belt rotating the driveshaft of a power plant pump. The torque applied by the belt on the pulley is 200 N ? m, and the power transmitted is 7 kW. Determine the net force applied by the belt on the pulley, in kN, and the rotational speed of the driveshaft, in RPM.

2. A 10-V battery supplies a constant current of 0.5 amp to a resistance for 30 min. (a) Determine the resistance, in ohms. (b) For the battery, determine the amount of energy transfer by work, in kJ.

3. Carbon monoxide gas (CO) contained within a piston- cylinder assembly undergoes three processes in series:

Process 1-2: Expansion from p1 5 5 bar, V1 5 0.2 m3 to V2 5 1 m3, during which the pressure-volume relationship is pV constant.

Process 2-3: Constant-volume heating from state 2 to state 3, where p3  5 5 bar.

Process 3-1: Constant-pressure compression to the initial state.

Sketch the processes in series on p-coordinates and evaluate the work for each process, in kJ.

4. Air contained within a piston-cylinder assembly undergoes three processes in series:

Process 1-2: Compression at constant pressure from p1 5 10 lbf/in.2, V1 5 4 ft3 to state 2.

Process 2-3: Constant-volume heating to state 3, where p3 5 50 bf/in.2

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