If 'humanity' created a huge GUN (okay, it would be the US...) that fired 100 kg shells from the surface of the Earth at a speed of 7.97 km/s, the shell's fired could go into orbit... a) What would their orbital altitude be? b) How fast would they be moving while in orbit? c) How long would it take one of the shell's to orbit the Earth 15 times? d) Once in orbit, how much additional energy would have to be given to the shell in order for it to escape Earth's gravitational field?
Gravitational force
In nature, every object is attracted by every other object. This phenomenon is called gravity. The force associated with gravity is called gravitational force. The gravitational force is the weakest force that exists in nature. The gravitational force is always attractive.
Acceleration Due to Gravity
In fundamental physics, gravity or gravitational force is the universal attractive force acting between all the matters that exist or exhibit. It is the weakest known force. Therefore no internal changes in an object occurs due to this force. On the other hand, it has control over the trajectories of bodies in the solar system and in the universe due to its vast scope and universal action. The free fall of objects on Earth and the motions of celestial bodies, according to Newton, are both determined by the same force. It was Newton who put forward that the moon is held by a strong attractive force exerted by the Earth which makes it revolve in a straight line. He was sure that this force is similar to the downward force which Earth exerts on all the objects on it.
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