1) The acceleration of a mass m due to Earth\'s gravitational force a) decreases

Question

1) The acceleration of a mass m due to Earth's gravitational force

a) decreases at very high altitude

b) is always 9.80 m/s

c) increases at very high altitude

d) is proportional to m

2) Astronomers calculate the rotation speeds of stars in galaxies by measuring

a) The speed of radio waves they emit

b) The speed of visible light they emit

c) The color of visible light they emit

d) The gravitational force from other stars inside their orbital radius

3) The rotation curve of planets around our Sun is different from stars around a galaxy's center because

a) of the Dark Matter believed to be between the planets and the Sun

b) Newton's gravity law does not apply to stars

c) the centripetal acceleration of stars falls less rapidly with increasing orbital radius

d) of the gravitational perturbation from unknown planets

4) Han Solo's famous boast that the Millennium Falcon "made the Kessel Run in less than 12 parsecs" is impressive because

a) the Kessel Run is 59 light years in length and no one could make the run in less than 18 parsecs

b) a parsec is the time it takes to travel the distance to the Sun (1 AU) while subtending a parallex of 1/3600 of a degree and 1 AU is about 8.3 light minutes.

c) Han's boast is dimensionaly incorrect

d) the Millennium Falcon can go "0.5 past light speed"

5) In this lab we determine the stellar mass-to light ratio analytically.

a) True

b) False

Explanation / Answer

1) The acceleration of a mass m due to Earth's gravitational force

a) decreases at very high altitude because g = GM/r^2

2) Astronomers calculate the rotation speeds of stars in galaxies by measuring

d) The gravitational force from other stars inside their orbital radius

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