True or false Sunlight hitting a car may cast a shadow

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

If a simple machine reduces the strength of a force, what must be increased?

Describe the three ray tracing steps used to identify an image for the given situation.