A cannon of mass 500 kg is loaded with a cannon ball of mass 1 kg. The cannon and ball are both stationary when the ball is fired at a velocity of 50 m/s. The cannon recoils when the
gun is fired. What is the absolute value of the recoil velocity of the cannon?

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

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.

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec