The typical density for a rock found on the surface of Earth is ________ the average density of Earth overall.
A. about equal to
B. greater than
C. less than
Answer: C
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What is galactic cannibalism?
What will be an ideal response?
A light ray strikes a hexagonal ice crystal floating in the air perpendicular to one face, as shown below. The hexagonal faces of the crystal are perpendicular to the plane of the page. All the rays shown are in the plane of the page, and nice = 1.30. Which outgoing ray is correct when the incoming ray strikes the crystal face on the left head on?
a.
A
b.
B
c.
C
d.
D
e.
E
An object in motion with constant speed along a straight line can never have nonzero angular momentum
Indicate whether the statement is true or false
James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 25 m/s
Compare the time it takes each to reach the lake below if there is no air resistance. A) Cannot be determined without knowing the weight of both James and John. B) James and John will reach the surface of the lake at the same time. C) Cannot be determined without knowing the mass of both James and John. D) James reaches the surface of the lake first. E) John reaches the surface of the lake first.