Four different main-sequence stars are colored blue, orange, red, and yellow. What is their rank from coolest to hottest?
A) red, yellow, orange, blue B) blue, yellow, orange, red
C) red, orange, yellow, blue D) orange, blue, yellow, red
C
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A.A B.B C.C D.D E. Toward the viewer F. Away from the viewer T. The field is zero.
A fancy sports car moves past an observer on a corner at a speed of 0.600c. When the observer indicates a one-second interval has passed, what time interval will be shown on the driver's watch?
A. 1.67 s B. 0.800 s C. 1.25 s D. 0.600 s E. 1.00 s
Several common barometers are built using a variety of fluids. For which fluid will the column of fluid in the barometer be the highest?
If the distance between Earth and a star is measured using parallax measurements, how far apart in time should the two measurements be made to make the parallax measurement as accurate as possible?
A. a day B. six months C. a year D. instantaneously