A 540 kg spacecraft first is placed into a circular orbit about the earth at an altitude
Question:
A 540 kg spacecraft first is placed into a circular orbit about the earth at an altitude of 4500 km and then is transferred to a circular orbit about themoon. Knowing that the mass of the moon is 0.01230 times the mass of the earth and that the radius of the moon is 1740 km, determine
(a) The gravitational force exerted on the spacecraft as it was orbiting the earth,
(b) The required radius of the orbit of the spacecraft about the moon if the periodic times of the two orbits are to be equal,
(c) The acceleration of gravity at the surface of the moon. (The periodic time of a satellite is the time it requires to complete one full revolution about a planet).
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In Physics, a force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. In this video, the concept of force and torque is demonstrated with the practical application of changing the flat tire of the car.
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