Suppose you live at latitude 40°N? Based on the given right ascensions and declinations, which of the following stars passes closest to your zenith on its daily path through your sky?
A) Spica: RA = 13hr 25m, dec = -11°09'
B) Deneb: RA = 20hr 41m, dec = +45°16'
C) Sirius: RA = 6hr 45m, dec = -16°42'
D) Alpha Centauri: RA = 14hr 40m, dec = -60°50'
E) Vega: RA = 18hr 37m, dec = +38°47'
E) Vega: RA = 18hr 37m, dec = +38°47'
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Time Dilation: At age 21, you set out for a star that is 50 light-years from Earth. How fast would your spaceship have to travel in order to reach that star when you are 61 years old? One light-year is the distance light travels in one year.
A. 0.58c B. 0.68c C. 0.78c D. 0.88c E. 0.96c
What is a central dominant galaxy?
A) a galaxy around which many other smaller galaxies orbit B) a giant spiral galaxy that exerts large tidal forces on other nearby galaxies C) a spiral galaxy from which many smaller galaxies form when it is stripped apart by tidal forces D) a giant elliptical galaxy at the center of a dense cluster E) a hypothesized galaxy type that no longer exists but once dominated the structure of the universe
In essence, the Kepler mission searched for extrasolar planets by ________
A) observing a star carefully enough to notice that it is experiencing a gravitational tug caused by an unseen planet B) identifying spectral lines that look like what we expect to see from a planet rather than a star C) monitoring stars for slight dimming that might occur as unseen planets pass in front of them D) obtaining high-resolution photographs of other star systems
By what factor is the self-inductance of an air solenoid changed if only its cross-sectional area, A, multiplied by eight?
a. 1/8 b. 8 c. 24 d. 64 e. 1/64