Aspring has a natural length of 10 cm. if a 26-n force is required to keep it stretched to a length of 16 cm, how much work w is required to stretch it from 10 cm to 13 cm? (round your answer to two decimal places.)

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?