1. The gravitational potential at the Earth's surface is about -60 MJ kg-1 . The work done in lifting a 2kg mass into deep space away from the Earth is therefore
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2. A planet that is twice as massive as the Earth but only has 1/2 the radius will therefore have a gravitational potential at the surface of about
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3. Which of these statements about the magnitude of the gravitational field strength at any point is true?
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4. Which of these diagrams shows the shape of equipotential surfaces around two identical binary stars? |
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Two small masses m and 2m are located at distances r and 2r from a much larger planet as shown.
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5. The ratio
is
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6. To escape the pull of a small spherical asteroid, a satellite needs to be launched with a certain escape velocity. Which of these 3 factors affects the escape velocity of the satellite?
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image: nasa.gov |
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7. To stay in a circular orbit of radius r around the Earth, a satellite of mass m has a potential energy of Ep. If the satellite now moves into a higher orbit of radius 2r, the potential energy..
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8. When in orbit, how is the gravitational potential energy (Ep) of a satellite related to the kinetic energy (Ek)?
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9. As the satellite moves into a higher orbit, how does the total energy and the kinetic energy change?
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