In the heliocentric model, the retrograde motion of the planets was explained as the consequence of the different orbital speeds of the planets, without the use of epicycles.
Answer the following statement true (T) or false (F)
True
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The distance between the two planets is 1.6 × 106 m. How much time would the light signal take to go from one planet to the other?
A) 1.9 × 10-2 s B) 0.45 × 10-2 s C) 0.53 × 10-2 s D) 1.3 × 10-2 s E) None of the other answers is correct.
Two light waves combine and produce a region of darkness. Which of the following must be true in that region?
A. The waves had different wavelengths B. The waves were a half-wavelength out of phase C. The waves were unpolarized D. The waves came from the same source
A hockey puck slides off the edge of a table at point A with an initial velocity of 20.0 m/s and experiences no air resistance. The height of the tabletop above the ground is 2.00 m
(a) What is the speed (not the velocity) of the puck just before it touches the ground? (b) What is the distance between point A and the point where the puck hits the ground? What will be an ideal response?
If the distance between us and a star is doubled, with everything else remaining the same, its luminosity
A) is decreased by a factor of two, and its apparent brightness is decreased by a factor of two. B) remains the same, but its apparent brightness is decreased by a factor of four. C) is decreased by a factor of four, and its apparent brightness is decreased by a factor of four. D) remains the same, but its apparent brightness is decreased by a factor of two. E) is decreased by a factor of four, but its apparent brightness remains the same.