A 16 solar mass main sequence star is at a smaller distance than a 1solar mass mainsequence star. Which star appears brighter?
a) cannot tell with the information given
b) stars are approximately the same brightness
c) the 16 solar mass main sequence star
d) depends on the phase of the Moon
e) the 1 solar mass main sequence star
Ans: c) the 16 solar mass main sequence star
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a. True b. False Indicate whether the statement is true or false
Which best describes the transit method?
a. observing changes in the brightness of the star when the orbiting planet crosses in front of the star b. observing the magnification of a distant star's brightness by gravitational lensing when an extrasolar planet passes precisely between Earth and a background star c. observing the back-and-forth motion that can be measured from Doppler shifts in a star's spectrum d. observing the intensity of brightness from a newborn distant star e. observing the magnification of a distant planet when it passes closely to our Solar System
A 4.00 kg object is moving at 3.00 m/s WEST. It strikes a 6.00 kg that is moving WEST at 2.00 m/s. The objects have a one-dimensional elastic collision in the EAST-WEST direction. The velocity of the 4.00 kg object after the collision is
A. 1.00 m/s WEST. B. 2.80 m/s EAST. C. 1.80 m/s WEST. D. 2.80 m/s WEST. E. 1.80 m/s EAST.
A ray of light traveling through water passes through an air bubble. Which path does it take?
A. A B. B C. C D. D E. E