The force needed to maintain a body at constant speed in outer space [far from all outside influences] is equal to
A) the mass of the body.
B) the weight of the body.
C) zero.
D) the force required to stop it.
E) None of the above.
C
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Which of the following measurements can be made only by recording and comparing the amount of light received from an astronomical source at many different times?
A) the rate at which a variable star brightens and dims B) the general shape of an interstellar cloud of gas C) the color of a planet D) the number of bright stars in a nearby star cluster
Recall the raisin cake model of the universe and its analogy to our expanding universe. Suppose you measure the recession velocity (the speed at which any object is moving away from us) of Galaxy A to be 2000 km/s and the recession velocity of Galaxy B to be 6000 km/s. What can you conclude about the relative distances of these two galaxies?
A) Galaxy A is 3 times as far from us as Galaxy B. B) Galaxy B is 3 times as far from us as Galaxy A. C) Galaxy A is 6 times as far from us as Galaxy B. D) Galaxy B is 6 times as far from us as Galaxy A. E) The relative distances cannot be determined from the information in this problem.
How long would it take for charged particles ejected from the sun to affect electrical systems on Earth, assuming the particles traveled at 1.6 million km/h?
A) A few minutes
B) A few hours
C) A few days
D) A few weeks
The Earth is 1.49 × 10^11 meters from the sun. If the solar radiation at the top of the Earth's atmosphere is 1 340 W/m2, what is the total power output of the sun?
a. 7.10 × 10^27 W b. 2.20 × 10^30 W c. 6.62 × 10^26 W d. 3.74 × 10^26 W e. 2.98 × 10^25 W