How do we know Earth has a liquid core?
A. P waves pass through it, but S waves do not.
B. Both S and P waves pass through it.
C. Because we have used X-rays to probe it.
D. S waves pass through it, but P waves do not.
Answer: A
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A compressed gas with a total mass of is stored in a spherical container having a radius of 0.521 m. What is the density of the compressed gas?
A) 181 kg/m3 B) 110 kg/m3 C) 134 kg/m3 D) 161 kg/m3
A mass is attached to a vertical spring and bobs up and down between points A and B. Where is the mass located when its kinetic energy is a maximum?
A) at either A or B B) midway between A and B C) one-fourth of the way between A and B
Given a concave mirror, rays of light originating from the center of curvature reflect off the mirror and focus at
A) 2 R from the mirror. B) the focal point. C) the center of curvature. D) infinity.
In a color television tube, electrons are accelerated through a potential difference of 20,000 volts. With what velocity do the electrons strike the screen?