Calculate the efficiency of an engine of the work input is 300 jewels and the work output is 100 rolls

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

The process of a material going through a change of state from a gas to a liquid

How do the forces acting on a boat compare to the force acting on a plane ?