Stars X and Y have the same luminosity, but star Y is 10 times as far from Earth as star X. How much brighter will star X appear in our sky than star Y?
A) 10 times
B) 100 times
C) 1000 times
D) 10,000 times
E) 100,000 times
B) 100 times
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Star A has a radius of 200 000 km and a surface temperature of 6 000 K. Star B has a radius of 400 000 km and a surface temperature of 3 000 K. The emissivity of both stars is the same. What is the ratio of the rate of energy radiated by Star A to that of Star B?
In 1974, astronomers sent an anticoded message as a string of 1679 _______________ and _______________
Fill in the blank(s) with correct word
A rifle is aimed horizontally at the center of a large target 60 m away. The initial speed of the bullet is 240 m/s. What is the distance from the center of the target to the point where the bullet strikes the target?
A. 48 cm B. 17 cm C. 31 cm D. 69 cm E. 52 cm
A 2500-kg truck moving at 10.00 m/s strikes a car waiting at a traffic light, hooking bumpers. The two continue to move together at 6.00 m/s. What was the mass of the struck car?
a. 1730 kg c. 1200 kg b. 1670 kg d. 1070 kg