Ions are in low concentration outside a cell. they move rapidly into the cell via protein molecules. what term describes this action? does it require energy?

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

To find the work done, the force exerted and distance moved are multiplied. a couch is moved twice before you are happy with its placement. the same force was used to move the couch both times. if more work is done the first time it is moved, what do you know about the distance it was moved? a) when more work was done, the couch was moved the same distance. b) when more work was done, the couch was moved less. c) when more work was done, the couch was moved further. d) when more work was done, the couch wasn't moved at all.

How do you determine the percent yield of a chemical reaction