FEBRUARY 10, 2012
Physics
Mr. Payne
MULTIPLE CHOICE ANSWERS
Number
Answer
Number
Answer
Number
Answer
1
B
4
A
7
D
2
C
5
D
8
D
3
C
6
C
9
C
SHORT ANSWER
QUESTION 10
10. Discuss the following statement: “A satellite is continually in free fall.”
Answer
A satellite in a circular orbit around Earth moves like a projectile. One
component of its motion is parallel to Earth’s surface, while the other
component is a free-fall acceleration toward Earth. The horizontal component
of the motion is just the right magnitude for Earth’s curved surface to fall
away at the same rate as the satellite’s free-fall acceleration.
SHORT ANSWER
QUESTION 11
Earth exerts a 1.0 N gravitational force on an apple.
11. Does the apple accelerate toward Earth, or does Earth accelerate toward
the apple? Explain your answer.
Answer
They both accelerate toward each other. Earth’s acceleration is extremely small
compared to that of the apple because Earth has a much greater mass than
the apple does.
SHORT ANSWER
QUESTIONS 12 AND 13
Earth exerts a 1.0 N gravitational force on an apple.
12. What is the magnitude of the gravitational force the apple exerts on
Earth?
Answer: 1.0 N
13. What is Earth’s weight in the apple’s gravitational field?
Answer: 1.0 N
SHORT ANSWER
QUESTIONS 14 AND 15
14. Briefly, how did Ptolemy describe the motion of the planets?
ANSWER:
Ptolemy described the planets moving in small circles called epicycles while
simultaneously moving in larger circles around Earth.
15. Briefly, how did Copernicus describe the motion of the planets?
ANSWER:
Copernicus described the planets, including Earth, moving in circular orbits
around the sun.
SHORT ANSWER
QUESTION 16
16. According to the big bang theory, what occurred in the brief instant after
the big bang?
ANSWER:
The four fundamental interactions of physics operated in a unified manner.
The high temperatures and energy caused all particles and energy to be
indistinguishable.
PROBLEMS
PROBLEM
ANSWER
17
4.10 X 105 m = 410 km
18
9.5 X 103 kg
19
1.4 X 105 m/s
20
5.4 X 106 s
BIG BANG THEORY
Review pages 936-942 from the textbook.
Be able to describe in general terms the history and possible fates of the
Universe. Know the four fundamental forces, and when they separated from
their common beginning.