A Planet having a mass of 5 x 10 17 kg has a radius of 2500m. If an object of mass 2 kg is on its surface , calculate the acceleration due to gravity of the planet ? Take G as 6.674 x 10 -11 N. m2 /kg2

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.

If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?

Blank liquids and gases exert a buoyant force on objects placed in them