The main reason a person weighs less at the equator than at the poles involves the
A) spin of the Earth.
B) influence of the Sun, Moon, and all the planets.
C) law of action and reaction.
Answer: A
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A torque of 20.0 N•m is applied to a bolt. The bolt rotates through an angle of 180 degrees. The work done in turning the bolt is
A. 72.5 J. B. 51.9 J. C. 62.8 J. D. 49.9 J. E. 58.4 J.
Why is the Chandra X-ray Observatory critical to mapping intracluster gas?
What will be an ideal response?
In an ideal case rays coming from an object toward a lens or mirror should be reasonably close to the optical axis. To the extent that this condition is not completely met, which one of the following effects occurs?
a. mirages c. spherical aberration b. chromatic aberration d. light scattering
Which of the following correctly describes how light will be affected as it tries to escape from a massive object?
A) Light escaping from a compact massive object, such as a neutron star, will be redshifted. B) Visible light escaping from a compact massive object, such as a neutron star, will be redshifted, but higher frequencies, such as X-rays and gamma rays, will not be affected. C) Less energetic light will not be able to escape from a compact massive object, such as a neutron star, but more energetic light will be able to. D) Light escaping from a compact massive object, such as a neutron star, will be blueshifted. E) Light doesn't have mass; therefore, it is not affected by gravity.