The flatness problem states that
a. the density of the Universe is very close to the critical density.
b. the density of the Universe is much larger than the critical density.
c. the density of the Universe is much less than the critical density.
d. the Universe is two-dimensional.
e. the Universe is one-dimensional.
a
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Shawn is traveling away from you at a speed of 120 km/hr. He throws a baseball that, according to him, is going at 100 km/hr in your direction. What do you see the ball doing?
A) You see the ball traveling away from you at 120 km/hr. B) You see the ball traveling away from you at 100 km/hr. C) You see the ball traveling away from you at 220 km/hr. D) You see the ball traveling toward you at 20 km/hr. E) You see the ball traveling away from you at 20 km/hr.
Three systems are constructed from identical springs and masses as shown
If a person weighs 150 lb on Earth, what will the person weigh on the Moon?
a. 25 lb b. 900 lb c. 150 lb d. 75 lb e. 300 lb
Compared to the recoiling cannon, a fired cannonball has a
A) greater momentum. B) greater kinetic energy. C) smaller speed. D) all of the above