ASTR 1161 Ch 4

Suppose you lived on the Moon. Which of the following would be true? A - Your weight would be less than your weight on Earth, but your mass would be the same as it is on Earth. B - Both your weight and your mass would be the same as they are on Earth. C - Both your weight and your mass would be less than they are on Earth. D - Your mass would be less than your mass on Earth, but your weight would be the same as it is on Earth.

Which of the following describes a speed, according to an astronomer? a. 20 meters per second, headed north b. 5 light-years c. 40 revolutions per hour d. 10 light-years per 1 million years

Suppose you visit another planet: a. Your mass and weight would be the same as they are on Earth. b. Your mass would be the same as on Earth, but your weight would be different. c. Your weight would be the same as on Earth, but your mass would be different.

Which of the following statements is NOT one of Newton's Laws of Motion? a. For any force, there always is an equal and opposite reaction force. b. The rate of change of momentum of an object is equal to the net force applied to the object. c. In the absence of a net force acting upon it, an object moves with constant velocity. d. What goes up must come down.

Which of the following examples describes a situation where a car is experiencing a net force? a. The car is making a gradual turn. b. The car is stopped on a hill. c. The car is moving at constant speed. d. The car is floating on a stationary boat.

Suppose that two objects collide. Which of the following things is NOT the same both before and after the collision? a. the total angular momentum of the objects b. the total energy of the objects c. the total momentum of the objects d. the total temperature of the objects

When a spinning ice skater pulls in his arms, he spins faster because _________.

What does temperature measure?

If you want to make a rocket turn left, you need to

Compared to its angular momentum when it is farthest from the Sun, Earth's angular momentum when it is nearest to the Sun is:

As an interstellar gas cloud shrinks in size, its gravitational potential energy:

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

Which statement must be true in order for a rocket to travel from Earth to another planet? a. It must attain escape velocity from Earth. b. It must be launched from space, rather than from the ground. c. It must carry a lot of extra fuel. d. It must have very large engines.

Which person is weightless? a. A child in the air as she plays on a trampoline. b. A scuba diver exploring a deep-sea wreck. c. An astronaut on the Moon.

Consider the statement "There's no gravity in space." This statement is:

Why is Newton's version of Kepler's third law so useful to astronomers?

If Earth were twice as far from the Sun, the force of gravity attracting Earth to the Sun would be:

According to the law of universal gravitation, what would happen to Earth if the Sun were somehow replaced by a black hole of the same mass?

If the Moon were closer to Earth, high tides would:

Radiative energy is