Exp 105 Week 8 Quiz

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Quiz 7
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Question 1 | | (1 point)Save |
Compared to the gravity at Earth’s surface, Earth’s gravity at a distance twice as far from Earth’s center is | a) | one half as much | | b) | one fourth as much | | c) | one sixteenth as much | | d) | zero | Question 2 | | (1 point)Save |
The potential energy of a satellite in a circular orbit is | a) | the same everywhere | | b) | greatest at the apogee (farthest point) | | c) | greatest at perigee (nearest point) | | d) | the same as its kinetic energy | Question
3 | | (1 point)Save |
A communications satellite that orbits at a fixed part of the sky | a) | travels at a speed of 8 km/s | | b) | takes 24 hours to complete each orbit | | c) | travels at a speed slightly greater than 8 km/s
| | d) | has zero orbital speed and doesn’t move | Question 4 | | (1 point)Save |
A spacecraft on its way from Earth to the Moon is pulled equally by Earth and Moon when it is | a) | closer to the Earth’s surface | | b) | closer to the Moon’s surface | | c) | halfway from Earth to Moon | | d) | at no point, since Earth always pulls more strongly | Question 5 | | (1 point)Save |
When a projectile achieves escape speed from Earth, it | a) | outruns the influence of gravity, but is never beyond it | | b) | forever leaves Earth’s gravitational field | | c) | comes to an eventual stop, eventually returning to Earth at some future time | | d) | likely becomes a black hole | Question 6 | | (1 point)Save |
A ball rolling along a bowling alley maintains its speed because | a) | it has inertia | | b) | gravity doesn’t pull on it while moving | | c) | there is no horizontal force acting on the ball | | d) | it behaves as a projectile | Question 7 | | (1 point)Save |
If you drop a ball it will fall 5 m in the first second of fall.
If instead you toss it sideways, in one second it will fall beneath its straight-line path a vertical distance of | a) | less than 5 m | | b) | 5 m | | c) | more than 5 m | | d) | none of these | Question 8 | | (1 point)Save |
A ball is thrown horizontally from atop of a 5-meter platform and travels a horizontal distance of 15 meters before hitting the ground below. The initial speed of the ball must have been about | a) | 5 m/s | | b) | 10 m/s | | c) | 10 m/s2 | | d) | 15 m/s | Question 9 | | (1 point)Save
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While a projectile moves horizontally with no change in motion, it moves vertically | a) | also with no change in motion | | b) | under the influence of gravity | | c) | equal vertical distances in equal times | | d) | none of these | Question 10 | | (1 point)Save |
The magnitude of G indicates than gravity is | a) | a relatively weak force | | b) | relatively strong force | | c) | responsible for the orbiting of planets | | d) | responsible for all falling objects | Question 11 | | (1 point)Save |
The concept of free falling objects applies to | a) | apples | | b) | the Moon | | c) | the planets | | d) | all of these | Question 12 | | (1 point)Save |
If the Sun were half as massive, its pull on Mars would be | a) | unchanged | | b) | twice | | c) | half | | d) | four times as much | Question 13 | | (1 point)Save |
Present speculation about the universe is that it is | a) | shrinking | | b) | remaining steady | | c) | growing | | d) | accelerating outward | Question 14 | | (1 point)Save |
Current speculation about the age of the universe is | a) | still not known | | b) | about 7000 years | | c) | some 13.7 billion years | | d) | infinite | Question 15 | | (1 point)Save |
If the mass of the Sun and a planet that orbits the sun are both doubled, with the distance being the same, the force of gravity between them | a) | remains unchanged | | b) | doubles | | c) | quadruples | | d) | increases by eight | Question 16 | | (1 point)Save |
The Moon falls toward the Earth in the sense that it falls | a) | with an acceleration of 10 m/s2, as do apples on Earth | | b) | beneath the straight-line path it would take if there were no gravity | | c) | both of the above | | d) | none of the above | Question 17 | | (1 point)Save |
The speed needed for a probe to escape planet Earth is about | a) | 8 km/s | | b) | 9.8 km/s | | c) | 11.3 km/s | | d) | 40 km/s | Question 18 | | (1 point)Save |
When an Earth satellite makes a circular orbit, it has constant | a) | speed | | b) | distance from the Earth | | c) | force of gravity on it | | d) | all of the above | Question 19 | | (1 point)Save |
The potential energy of a satellite in an elliptical orbit is | a) | the same everywhere | | b) | greatest at the apogee (farthest point) | | c) | greatest at perigee (nearest point) | | d) | the same as its kinetic energy | Question 20 | | (1 point)Save |
Consider a space probe whose distance from Earth’s center is four Earth-radii. Compared with the probe’s weight at Earth’s surface, its gravitational attraction to Earth is about | a) | one half as much | | b) | one fourth as much | | c) | one sixteenth as much | | d) | zero |

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