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Question: When a spacecraft travels from the Earth to the Moon, both the Earth and the Moon exert a gravitational force on the spacecraft. Eventually, the spacecraft reaches a point where the Moon's gravitational attraction overcomes the Earth's gravity.
Part A: How far from the Earth's surface must the spacecraft be for the gravitational forces from the Moon and the Earth to just cancel?
I want help to find how far from the Earth's surface must the spacecraft be.
A projectile is launched perpendicularly upward from a planet of mass M; and radius R; its initial speed is twice the escape speed. Derive an expression for its speed as a function of the distance from the center of the planet.
The launching speed of a certain projectile is five times the speed it has at its maximum height. Calculate the elevation angle at lauching
starting at rest two students stand on 20-kg sleds which point away from each other on ice and they pass a 10-kg
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