The are antagonistic muscles

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

Which transition by an electron will release the greatest amount of energy? oa ob oc od

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects