Water is flowing at 4.0 m/s in a circular pipe. If the diameter of the pipe decreases to 1/2 its former value, what is the velocity of the water downstream?
a. 1.0 m/s
b. 2.0 m/s
c. 8.0 m/s
d. 16 m/s
e. 4.0 m/s
d
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Alfred Wegener postulated that the continents were once part of a single supercontinent that he called ______________
a. Pangaea b. Africasia c. Amerasia d. Atlantis
Four of following are factors that must be overcome by a large molecular cloud before gravitational contraction can begin. Which one is the exception??
A. thermal energy of gas B. magnetic fields C. rotation of gas clouds D. intense radiation from a nearby star
Astronomers believe that most of the meteorites come from broken up asteroids and comets, but some of the meteorites are fragments from the Moon or Mars.
Answer the following statement true (T) or false (F)
Two satellites with equal rest masses of 100 kg are traveling toward each other in deep space. They have identical speeds of 0.600c
The satellites collide and somehow manage to stick together. What is the rest mass of the combined object after the collision? A) 200 kg B) 225 kg C) 250 kg D) 275 kg E) 300 kg