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Chapter 13: Q. 4 (page 353)
How far away from the earth must an orbiting spacecraft be for the astronauts inside to be weightless? Explain.
It must be at half the radius of earth (R/2)
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A lunar lander is in orbit above the surface of the moon. It needs to move out to a high orbit in order to link up with the mother ship that will take the astronauts home. How much work must the thrusters do?
The International Space Station orbits above the surface of the earth. What is the gravitational force on a sphere inside the International Space Station?
An astronaut on earth can throw a ball straight up to a height of How high can he throw the ball on Mars?
A new planet is discovered orbiting the star Vega in a circular orbit. The planet takes earth years to complete one orbit around the star. Vega鈥檚 mass is times the sun鈥檚 mass. What is the radius of the planet鈥檚 orbit? Give your answer as a multiple of the radius of the earth鈥檚 orbit.
The space shuttle used to fly in a high circular orbit. It needed to reach a high circular orbit to service the Hubble Space Telescope. How much energy was required to boost it to the new orbit?
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