At what distance from the center of the Earth would one’s weight be half that recorded on the Earth’s surface? Let the Earth's radius be R.
A. 0.4R
B. 0.7R
C. 0.5R
D. R
E. 1.4R
F. 3R
A. 0.4R
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Galileo wrote the Almagest
a. True b. False Indicate whether the statement is true or false
In Ptolemy's view of the universe, a planet moves on an epicycle whose center moves around the Earth on the deferent circle
a. Correct
b. FALSE; Ptolemy put the Sun at the center.
c. FALSE; The planet stays on the deferent circle.
d. FALSE; The Earth is at the center of the epicycle.
e. FALSE; Both c and d are correct.
A stick is moving along the x-axis at 90%c. A person riding with the stick sees it inclined at 45.° with respect to the x-axis. Observers in the rest frame see the stick making what angle with respect to the x-axis?
A) 79.° B) 66.° C) 53.° D) 45.° E) 88.°
In a standing wave, not necessarily at the fundamental frequency, on a string of length L, the distance between nodes is
a. ?/4. b. ?/2. c. ?. d. L/4. e. L/2.