Can we always see the same amount of the illuminated side of the moon from earth?

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

When an object is heated it contracts. a. true b. false

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)