An astronaut outside a spaceship hammers a loose rivet back in place. What happens to the astronaut as he swings the hammer?
a. Nothing. The spaceship takes up the momentum of the hammer.
b. He moves away from the spaceship.
c. He moves towards the spaceship.
d. He moves towards the spaceship as he pulls the hammer back and moves away from it as he swings the hammer forward.
e. He moves away from the spaceship as he pulls the hammer back and moves toward it as he swings the hammer forward.
d
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On the scale of the cosmic calendar, in which the history of the universe is compressed to 1 year, how long has human civilization (i.e., since ancient Egypt) existed?
A) a few seconds B) about a month C) less than a millionth of a second D) a few hours E) about half the year
In the above model of an atom, where would the proton be located?
a. A
b. 1
c. 2
d. 3
It takes about ____ to travel from the earth to the moon
Fill in the blank(s) with the appropriate word(s).
Our solar system is located about 27,000 light-years from the galactic center. How far does our solar system travel in one orbit?
A) 85,000 light-years B) 54,000 light-years C) 100,000 light-years D) 170,000 light-years