Star A has an apparent magnitude of 3 and Star B has an apparent magnitude of 5. Which star is brighter in our sky?
A) Star A
B) Star B
C) The two stars have the same brightness in our sky, but Star A is closer to us than Star B.
D) There is not enough information to answer the question.
A
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The fact that gasoline overflows a full tank on a hot day is evidence that
A) gasoline expands more with increasing temperature than its tank. B) the tank contracts while gasoline expands with temperature. C) both of these D) neither of these
An athlete participates in an interplanetary discus throw competition during an Olympiad that takes place on a planet where the acceleration due to gravity is 9.7 m/s2
He throws the discus with an initial velocity of 20 m/s at an angle of 60° from the vertical. Neglecting air resistance and the height of the discus at the point of release, what is the range of the discus? A) 36 m B) 40 m C) 60 m D) 21 m E) 32 m
The surface of the Sun has a temperature of about 5 770 K. If the radius of the Sun is 7 × 10^8 m, determine the power output of the Sun. (Take e = 1, and ? = 5.67 × 10^?8 W/m2/K4)
a. 3.9E+26 W b. 1.2E+26 W c. 6.7E+22 W d. 2.2E+30 W e. 5.5E+17 W
A spaceship with a constant speed of 0.800c relative to Earth travels to a star that is 4.30 light-years from Earth. How much time for this trip would elapse on a clock on board the spaceship?
A) 3.23 y B) 5.38 y C) 4.40 y D) 5.15 y