question
Which person is weightless during the activity shown?
question
Which of the following statements about the force attracting these two galaxies is true?
answer
It is the same force that causes an apple to fall to the ground.
question
The diagram above shows a planet at four positions in its orbit. At which position does it have the greatest angular momentum?
answer
The angular momentum is the same at all four points
question
The diagram above shows a planet at four positions in its orbit. At which position does it have the greatest gravitational potential energy?
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question
The diagram above shows a planet at four positions in its orbit. At which position does it have the greatest total orbital energy? (Orbital energy is the sum of the planet's kinetic and gravitational potential energy.)
answer
The total orbital energy is the same at all four points
question
Which of the paths shown represent unbound orbits?
question
Suppose you are aboard a rocket that is orbiting Earth in the low, circular orbit shown. If you want to escape from Earth and head to the Moon or Mars along the escape path shown, what do you need to do?
answer
Fire the rocket engine in your direction of travel, so that you gain speed.
question
In which position(s) of the Moon do we experience the highest high tides?
question
In which position(s) of the Moon do we experience the lowest low tides?
