Earth's internal layers were discovered by studying the propagation of P- and S- waves through Earth's interior. In comparison to P-waves, the movement of S-waves are
A) faster and compresses and expands the rock as they move through it.
B) faster and vibrates rock particles up and down and side-to-side.
C) slower and can travel through solid granite, magma, water or air.
D) slower and they can only travel through solids, not liquids.
Answer: D
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Fill in the blank(s) with correct word
Newton's Second Law in 1 Dimension: A box of mass 72 kg is at rest on a horizontal frictionless surface. A constant horizontal force of magnitude F then acts on the box, accelerating it to the right. You observe that it takes the box 3.4 seconds to travel 13 meters. What is the magnitude of the force F?
Fill in the blank(s) with the appropriate word(s).
Why can't astronomers use the 21-cm line of neutral hydrogen gas to measure the masses of elliptical galaxies?
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The density of Mars is very similar to that of the other terrestrial planets
Indicate whether the statement is true or false