Suspend a u tape from a thread or a hair. hold the thread or hair in your hand, or use a short piece of tape to stick the upper end of the thread or hair to the meterstick. approach the suspended tape from various directions with another u-tape. do you find that the force does indeed act along a line drawn from one object to the other?

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Can anybody me with this? ? (picture included.)

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.