The star Wolf 359 is 7.7 light years away. What is that distance in kilometers?
a. 7.7 x 10^8 km
b. 14 x 10^13 km
c. 0.78 x 10^8 km
d. 7.28 x 10^13 km
e. 7.28 x 10^12 km
d
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Time Dilation: An astronaut on a spaceship moving at 0.927c says that the trip between two stationary stars took 4.26 y. How long does this journey appear to take to someone in the rest frame of the two stars?
A. 11.4 y B. 1.60 y C. 2.30 y D. 12.6 y
Work Done by a Gas: A gas expands from an initial volume of 0.040 m3 and an initial pressure of 210 kPa to a final volume of 0.065 m3 while its temperature is kept constant. How much work is done by the gas? (R = 8.31 J/mol ? K)
A. 3.7 kJ B. 4.1 kJ C. 5.3 kJ D. 5.6 kJ E. 7.9 kJ
Planet A has twice the mass of Planet B. From this information, what can we conclude about the acceleration due to gravity at the surface of Planet A compared to that at the surface of Planet B?
A) The acceleration due to gravity on Planet A is greater than the acceleration due to gravity on Planet B, but we cannot say how much greater. B) The acceleration due to gravity on Planet A must be four times as great as the acceleration due to gravity on Planet B. C) The acceleration due to gravity on Planet A must be twice as great as the acceleration due to gravity on Planet B. D) The acceleration due to gravity on Planet A is the same as the acceleration due to gravity on Planet B. E) We cannot conclude anything about the acceleration due to gravity on Planet A without knowing the radii of the two planets.
Tensional forces cause the crust to
A) buckle and fold, thereby shortening the crustal surface. B) buckle and fold, thereby lengthening the crustal surface. C) stretch and pull, thereby shortening the crustal surface. D) break and fracture, thereby lengthening the crustal surface.