The celestial coordinates of the red dot on this diagram of the celestial sphere are approximately
A) Dec = +60º, RA = 6 hr.
B) Dec = -60º, RA = 6 hr.
C) Dec = ?60º, RA = 12 hr.
D) Dec = +60º, RA = 12 hr.
A) Dec = +60º, RA = 6 hr.
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Star A is identical to Star B, except that Star A is twice as far from us as Star B. Therefore,
A) both stars have the same luminosity, but the apparent brightness of Star B is twice that of Star A. B) both stars have the same apparent brightness, but the luminosity of Star B is four times that of Star A. C) both stars have the same luminosity, but the apparent brightness of Star A is four times that of Star B. D) both stars have the same luminosity, but the apparent brightness of Star B is four times that of Star A.
What is the definition of heat capacity?
a. The amount of heat that raises one gram of water one degree Celsius. b. The amount of heat that raises the temperature of an object one degree Celsius. c. The amount of heat an object can stand before it burns up. d. The maximum amount of heat an object can hold. e. The amount of heat an object can pass to a cooler object.
Movement of the lithosphere
A) has a plastic-like flow. B) causes earthquakes and volcanic activity. C) has a leisurely pace and allows the formation of gentle rolling hills. D) is intermittent.
Lead has a shear modulus of 
and a density of 
What is the velocity of shear waves in lead?
A. 691 m/s B. 621 m/s C. 575 m/s D. 521 m/s E. 487 m/s