Penny is pushing a piston in a simple hydraulic system. Pauly is pushing on the other piston just hard enough to keep it from moving. If Penny's piston is wider than Pauly's, who is pushing with greater force?
A.
There is not enough information.
B.
Pauly is exerting the greater force.
C.
They are both using equal force.
D.
Penny is exerting the greater force.

An engine undergoes a cycle as shown in the diagram. during a complete cycle the work done by the gas is 28.5×103 j and the energy transferred thermally out is 99.4×103 j. there are 1.5×1024 gas molecules and they have three active degrees of freedom. 6. (6 pts) during which process(es) is energy transferred thermally into the gas? a. 1→2 b. 2→3 c. 4→1 d. 1→2 and 4→1 e. none of the above