Who discovered Pluto?
a. Galileo Galilei
b. William Herschel
c. John Couch Adams
d. Percival Lowell
e. Clyde Tombaugh
e
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The following force vectors act on an object: i) 50.0 newtons at 45.0 degree north of east and ii) 25.0 newtons at 30.0 degree south of east. Which of the following represents the magnitude of the resultant and its angle relative to the easterly direction?
A formal, written purpose statement summarizes your website's goals and objectives.
Answer the following statement true (T) or false (F)
On the autumnal equinox, the Sun sets ________.
A. south of west B. south of east C. due east D. due west E. north of east
Why are Cepheid variables so important for measuring distances in astronomy?
A) They all have the same luminosity. B) They all have the same period. C) Their luminosity can be inferred from their period. D) They are close enough to have a detectable parallax. E) They are circumpolar like Polaris, the North Star.