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.

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve