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Physics 1408

Online Quiz 12

Since you may take the online quizzes as often as you like, your highest average should be pretty good. However, in order to keep track, you must fill out the student name and id# part of the form.

Question 1. Who was the best naked-eye (pre-telescope) astronomer whose observations were precise enough to determine the actual motion of the planets?
(a) Copernicus
(b) Brahe
(c) Newton
(d) Kepler
(e) Hermes
 
 
Question 2. Who used the data from these observations to show that the planets move in elliptical orbits about the sun?
(a) Copernicus
(b) Brahe
(c) Newton
(d) Kepler
(e) Hermes
 
 
Question 3. Who developed a theory of gravity that explained the elliptical motion of the planets?
(a) Copernicus
(b) Brahe
(c) Newton
(d) Kepler
(e) Hermes
 
 
Question 4. If the universal gravitational constant G = 6.7×10-11N m²/kg², the mass of the earth me = 6×1024 kg, and the radius of the earth Re = 6.4×106 m, then the value (in m/s²) of the quantity [G me/Re2] is approximately
(a) 0     (b) 5     (c) 10     (d) 15     (e) 25
 
 
Question 5. In the previous question you computed the value of ag at the earth's surface as approximately 10 m/s². The value of the acceleration of gravity ag (in m/s²) at a distance from the earth's center of two times the radius of the earth is
(a) 0     (b) 0.625     (c) 2.5     (d) 5.0     (e) 10.0
 
 
Question 6. How far (in m) will a spacecraft fall out of its straight-line trajectory in 1 s if it is in orbit at a distance from the earth's center of two times the radius of the earth?
(a) 0     (b) 0.313     (c) 1.25     (d) 2.5     (e) 5.0
 
 
Question 7. If the acceleration due to the earth's gravity is 0.1 inch/s² at a distance 60 Re from the center of the earth, how far (in inches) will the moon fall out of its straight-line trajectory in 1 s?
(a) 0     (b) 0.05     (c) 0.10     (d) 6.0     (e) 9.0
 
 
Question 8. Who proved his theory of gravity by showing that the moon drops 1/20th of an inch below its straight-line path every second?
(a) Copernicus
(b) Brahe
(c) Newton
(d) Kepler
(e) Hermes
 
 
Question 9. If the force of gravity between two objects a distance d apart is 8 N, then when the separation distance between the objects is increased to 2d the force of gravity (in N) becomes
(a) 0     (b) 2     (c) 4     (d) 8     (e) 16
 
 
Question 10. On earth, the tides are caused primarily by
(a) the sun
(b) the moon
(c) El Niño
(d) the tenth planet
(e) Neptune

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