According to our present theory of solar system formation, which of the following best explains why the solar nebula ended up with a disk shape as it collapsed?
A) The force of gravity pulled the material downward into a flat disk.
B) The law of conservation of energy
C) It was fairly flat to begin with, and retained this flat shape as it collapsed.
D) It flattened as a natural consequence of collisions between particles in the nebula.
D
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A girl throws a rock horizontally, with a velocity of 10 m/s, from a bridge. It falls 20 m to the water below. How far does the rock travel horizontally before striking the water, assuming negligible air effects?
A) 14 m B) 16 m C) 20 m D) 24 m
A device that measures absolute air pressure is called a __________
Fill in the blank(s) with correct word
You are at the leading end of a canoe and your friend is at the trailing end as the canoe is drifting along at a speed of v. You toss a backpack to your friend and he catches it. What is the canoe's speed after your friend catches the backpack compared to before you threw it? Ignore any friction effects between the canoe and the water
1.It is greater than v. 2.It is less than v. 3.It now has the same speed it had before the backpack was thrown. 4.We cannot tell from the information given.
A lathe, initially at rest, accelerates at 0.60 rad/s2 for 10 s, then runs at a constant angular velocity for 20 s, and finally decelerates uniformly for 10 s to come to a complete stop. What is its average angular velocity?
A) 4.5 rad/s B) 3.5 rad/s C) 5.0 rad/s D) 3.0 rad/s E) 4.0 rad/s