Astronomy

Which of the following does not have a net force?

An elevator moving up at a constant speed

What is required to change an object’s angular momentum?

a twisting force

A rock held above the ground has

potential energy

If you double the distance between two objects, the gravitational force force between them

is ¼ the original force

If you double the mass of one of the objects and keep the distance the same, the gravitational force between them

doubles

If you double the mass of one of the objects and double the distance between them, the gravitational force between them

is ½ the original force

If you double the mass of both objects, and double the distance between them, the gravitational force between them

remains the same

The Voyager II spacecraft, which has visited all of the giant planets and is now on its way out of the solar system, is travelling at least

at a speed of 11 km/s on an unbound orbit

Why is a violet purple?

The violet reflects purple light

The lower the photon energy

the longer its wavelength

Everything looks orange through an orange filter because

The filter transmits the orange light and absorbs other colors

What kind of spectrum would a neon gas
tube show?

emission

What kind of spectrum would the star
Betelgeuse show?

absorption

Which is hottest?

a blue star

Why don’t we glow in the dark?

People only emit light that is invisible to our
eyes

I measure a line in the lab at 500.7 nm. The same line in a star has a wavelength of 502.8 nm. What can I say about this star?

It is moving away from me

I measure a line in the lab at 500.7 nm. The same line in a star has a wavelength of 500.7 nm. What can I say about this star?

It is moving perpendicularly

What probe crashed into Mercury almost 10 years ago?

Messenger

Why are Mars‘ volcanos so tall?

It has no plate tectonics and low surface gravity

What process created the elements from which the terrestrial planets were made?

Nuclear fusion in stars

Which planet is the least dense?

Saturn

___emits 2x as much heat as it receives from the Sun, due to contraction.

Jupiter

Which moon is responsible for Jovian auroras?

Io

Io’s torus around Jupiter is fed by Io’s ___.

gases

Jupiter does not have a large metal core like the Earth. How can it have a magnetic field?

It has metallic hydrogen inside, which circulates and makes a magnetic field.

How does Io get heated by Jupiter?

Tidal resonance

This moon has volcanoes.

Io

This moon has an atmosphere.

Titan

This moon is the largest in the solar system.

Ganymede

This moon has a salt water ocean.

Europa

What shape are moons?

large ones are spherical, small ones irregular

Why do Jupiter, Saturn, Uranus, and Neptune
all have rings?

All have small moons and orbiting particles that
constantly collide and make rings