A satellite is placed in orbit about the Moon at a height of 60 km above the Moon surface. The Moon has a radius of 1.7 x 106 m and a mass of 7.3 x 1022 kg. What is the radius of the orbit? (in metres) Answer: 1.76 x 10^6 To calculate the radius of the orbit you need to add the radius of the moon to height of the satellite above the surface of the moon. r= 60 km + 1.7 x 105 m. Remember 60km-60000m What is the strength of gravity of the Moon on the satellite? (N/kg) Answer: 1.57 What is the orbital speed of the satellite? (m/s) Answer: 1.66 x 10^3 Use v=sqrt(GM/r). The M is the mass of the moon. What is the time period of the orbit? (s) Answer: 6662 x T=(2*Pi*r/v)
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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