The force that causes an object to fall to earth is
A. gravitational force.
B. electromagnetic force.
C. weak interaction.
D. strong nuclear force.
A. gravitational force.
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The activation enthalpy for self-diffusion is directly related to the strength of chemical _____________.
Fill in the blank(s) with the appropriate word(s).
Which of the following particles (or groups of particles) are made up of quarks?
A) protons, neutrons, and electrons B) electrons and neutrinos C) photons D) protons and neutrons E) All particles except for photons are made up of quarks.
To maximize the magnification of a refracting telescope, what lenses should you choose?
A) The objective lens should have a small focal length and the eyepiece should have a large focal length. B) The objective lens and eyepiece should both have large focal lengths. C) The objective lens and eyepiece should both have small focal lengths. D) The objective lens should have a large focal length, but it doesn't matter what the focal length of the eyepiece is. E) The objective lens should have a large focal length and the eyepiece should have a small focal length.
California's Sierra Nevada are examples of ______________ mountains
Fill in the blank(s) with correct word