How much charge is on a segment ds ? Express your answer in terms of some, all, or none of the variables Q , a , θ , dθ , and the constant π .

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.

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration