The Earth exerts a gravitational force on a person standing on the surface. The person also exerts a gravitational force on the Earth. Based on Newton's third law of motion, how do these two forces compare?
A) The forces exerted by the Earth and the person are the same.
B) The Earth exerts a much stronger force than the person.
C) The person exerts a much stronger force than the Earth.
D) The Earth exerts a slightly stronger force than the person.
E) The person exerts a slightly stronger force than the Earth.
A) The forces exerted by the Earth and the person are the same.
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Which of the following statements are correct? (There could be more than one correct choice.)
A) Spherical aberration, but not chromatic aberration, occurs for lenses. B) Chromatic aberration, but not spherical aberration, occurs for lenses. C) Both chromatic aberration and spherical aberration occur for lenses. D) Both chromatic aberration and spherical aberration occur for spherical mirrors.
A kind of analogy or mental image of a phenomenon in terms of something we are familiar with is referred to as a
A) model. B) theory. C) law. D) principle. E) hypothesis.
The time for the Moon to orbit Earth, relative to the stars is
A) 23 hours, 56 minutes. B) about 7 days. C) 27.3 days. D) 29.5 days. E) 18 years, 11.3 days.
To determine an unknown crystal structure, it would be best to use
(a) The Debye-Scherrer camera (b) The Laue technique (c) A powder diffractometer (d) A single-crystal diffractometer