question

The mass of Jupiter is calculated by

answer

measuring the orbital period and distance of one of Jupiter's moons.

question

At which lunar phase(s) are tides least pronounced (e.g., the lowest high tides)?

answer

both first and third quarters

question

Changing the orbit of a spacecraft by firing thrusters is an example of

answer

Newton's third law of motion

question

Which of the following is an example in which you are traveling at constant speed but not at constant velocity?

answer

driving around in a circle at exactly 100 km/hr

question

The ultimate source of energy that powers the Sun is

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mass energy of hydrogen fusing into helium.

question

If an object's velocity is doubled, its momentum is

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Doubled

question

The allowed shapes for orbits under the force of gravity are

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ellipses, parabolas, and hyperbolas.

question

According to the universal law of gravitation, if you triple the distance between two objects, then the gravitational force between them will

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decrease by a factor of 9.

question

You are standing on a scale in an elevator. Suddenly you notice your weight decreases. What do you conclude?

answer

The elevator is accelerating downwards.

question

Newton's second law of motion tells us that the net force applied to an object equals its

answer

mass times acceleration.