Author Question: According to their rotation curves, most spiral galaxies A) rotate as a solid body. B) rotate ... (Read 90 times)

futuristic · **on:** Jul 27, 2018

According to their rotation curves, most spiral galaxies

A) rotate as a solid body.
B) rotate counterclockwise.
C) have decreasing rotational speeds with increasing distance.
D) contain dark matter.
E) contain dark energy.

Question 2

Each of the following lists two facts. Which pair can be used with Newton's version of Kepler's third law to determine the mass of the Sun?

A) Mercury is 0.387 AU from the Sun, and Earth is 1 AU from the Sun.
B) The mass of Earth is 6 1024 kg, and Earth orbits the Sun in 1 year.
C) Earth rotates in 1 day and orbits the Sun in 1 year.
D) Earth is 150 million km from the Sun and orbits the Sun in 1 year.
E) Jupiter is the most massive planet and has a mass of 1.9 1027 kg.