Find the density of a soda can with a radius of 3.25 cm, a height of 12.2 cm, and a mass of 40 g.

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.

In a good thermo flask the main cause of heat loss is

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?