Astronomy Exam 2

29. Suppose the distance between two objects tripled. The resultant gravity would be

d. 1/9 of the original

Why is Polaris unique?

d. It remains stationary

Which of the following accurately describes the orbital motions of the planets?

d. None of the above

. There is a force of gravitation between

d. any two objects.

Suppose there were another planet between Saturn and Uranus. Which of the following statements would be true ?

d. its speed in orbit would be greater than Earth's.

10. The geocentric model was accepted for so long because

e. All of the above

18. The statement that astronauts on the Moon are weightless is

e. False because the Moon exerts a gravitational force on their bodies

The first astronomer to use the telescope was

e. Galileo

D (the sun's path) is called the

Ecliptic

Think about the Earth's precession. The star Thuban was the North Star in 4500 B.C.E. When was it the North Star prior to that?

Never

The object that falls at A is the

North star

21. Which of the following lists the men in the order in which they lived?

a. Aristotle, Ptolemy, Copernicus, Galileo, Newton

. The astronomer who formulated the laws of planetary motion from Tycho's data was

a. Kepler

The point at which the Earth is closest to the Sun is called

a. Perihelion

19. Why, according to Aristotle, do objects in the heavens behave differently from objects on Earth?

a. They are made of a different element; they are perfect.

8. Think about the motions of the planets as viewed from Earth. Why do planets move retrograde in the sky?

a. They are viewed from the Earth, which is also moving, but at a different rate, and this leads to a perceived retrograde motion b. Planets travel in epicycles within their orbits

7. Think about your Scantron sheet, which is at this moment pressing down on the desk. Does the desk exert a force upwards on the sheet?

a. Yes

14. Think about Polaris. True or False: it is always at your zenith.

b. False

The telescope was invented in

c. 1608

Suppose a heavy anvil and a feather were dropped from the top of a mountain on the moon. What will happen?

c. They will impact the lunar surface at the same time

Suppose you are an astronaut taking a spacewalk alongside the space shuttle to make a repair on it with a hammer. Your life-line breaks and the jets on your backpack do not work. How can you get back to the space shuttle safely?

c. Throw your hammer away from the ship

Point C

celestial equator

Point A

celestial north pole

Point B is called

celestial south pole