Which refers to the ratio of output force to input force of a machine?
mechanical advantage
average strength
total power
energy requireme

Where do magnetic lines of force enter earth?

Current from a charged capacitor lights a bulb. as time goes on the brightness of the

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?