The most important force in the hydrogen atom is
a. the nuclear force.
b. the gravitational force.
c. the electromagnetic force.
d. none of these.
c
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Of the billions of possible combinations of atoms into organic molecules, only about 1500 actually occur
Indicate whether the statement is true or false
A nucleon is
A) a neutron or a proton. B) a nucleus made of neutrons only. C) a neutron or proton when in the nucleus. D) a neutron, proton, or positron when in the nucleus. E) a neutron or positron when in the nucleus.
Which of the following seems to be a region of self-sustaining star formation?
A) The Orion complex B) The asteroid belt C) The Kuiper Belt D) The Solar System
Uniform Circular Motion: When an object moves in uniform circular motion, the direction of its acceleration is
A. in the same direction as its velocity vector. B. in the opposite direction of its velocity vector. C. is directed toward the center of its circular path. D. is directed away from the center of its circular path. E. depends on the speed of the object.