| 51. |
Earth has radius R. Which of the
following statements is true?
| A. |
Orbital Period A is larger and
velocity A is smaller.
|
| B. |
Orbital Period A is larger and
velocity A is larger.
|
| C. |
Orbital Period A is smaller and
velocity A is smaller.
|
| D. |
Orbital Period A is smaller and
velocity A is larger. |
|
Answer |
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| 52. |
| As a planet moves from point A to
point B in its orbit, which of the following happens?
Answer
|
 |
|
|
|
|
|
|
|
A. |
Potential energy increases and
kinetic energy increases.
|
C. |
Potential energy decreases and
kinetic energy increases.
|
|
B. |
Potential energy increases and
kinetic energy decreases. |
D. |
Potential energy decreases and
kinetic energy decreases. |
|
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| 53. |
| A space craft is in an elliptical
orbit around Earth.
Area 1 + Area 3 = Area 2
It takes 1.00 h to get to the end of Area 1 and a total of 4.00 h to get to the end Area 2. How much time does it
take to get from the start to the end of Area 3? Answer |
 |
|
|
|
|
|
|
|
A. |
5.50 h |
C. |
6.50 h |
|
B. |
6.00 h |
D. |
7.00 h |
|
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|
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| 54. |
| There is a force of 50.0 N on the 75.0
cm string. What is the velocity of the ball?
Answer
A. 3.54 m/s
C. 12.5 m/s
B. 11.2 m/s
D. 125 m/s |
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| 55. |
| The airplane to the right, moving in a
clockwise circular path, drops a package at point A.
Where on the ground does the package hit?
Answer
|
 |
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| 56. |
| A 5.00 kg model airplane is flying in
a circular path of radius 20.0 m. If the centripetal
acceleration is 8.00 m/s2, what is the velocity of the
airplane? Answer
A. 1.26 m/s
B. 1.60 m/s
C. 6.30 m/s
D. 8.00 m/s |
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| 57. |
The centripetal
force on the airplane above is quadrupled while keeping the radius the
same. What happens to the velocity of the airplane?
Answer
|
|
A. |
one-fourth as much |
C. |
doubled |
|
B. |
one-half as much |
D. |
quadrupled |
|
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|
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| 58. |
The data table below gives
the mean radius of orbit (R) and the period (T) of planets orbiting
the Sun. What ratio is constant for these planets?
Answer
|
| Planet |
Mean Radius of Orbit (R)
(x 10 6 kilometers) |
Orbital Period (T) days |
| Mercury |
58 |
88 |
| Venus |
108 |
225 |
| Earth |
150. |
365 |
| Mars |
228 |
687 |
|
|
A. |
R
---
T
|
C. |
R2
-----
T2 |
|
B. |
R2
----
T |
D. |
R3
----
T2 |
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| 59. |
| What is the direction of the
centripetal force?
Answer
|
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|
|
A. |
Straight down toward Earth. |
C. |
Along the string toward the
center. |
|
B. |
Straight up away from Earth. |
D. |
Along the string toward the
ball. |
|
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| 60. |
| If the ball to the right is on a
frictionless surface and the string breaks, what is the path of the
ball?
Answer
|
|
|
|
A. |
Straight out away from the
center. |
C. |
Perpendicular to the string and
to the left facing the ball from the center.
|
|
B. |
Straight inward towards the
center. |
D. |
Perpendicular to the string and
to the right facing the ball from the center. |
