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
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
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