A significant step in "unifying" the forces of nature was the discovery that two of the so-called fundamental forces were two parts of a single force. The two forces that were so unified were
A) the electromagnetic force and the weak force.
B) the weak force and the strong nuclear force.
C) the electromagnetic force and the strong nuclear force.
D) the electromagnetic force and the gravity force.
A
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The process by which a single cell from a living organism is used to grow an entirely new organism with an identical set of genes is referred to as
A) replication B) twinning C) cloning D) genetic copying
Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the magnetic force that each wire exerts on the other?
A) It is doubled. B) It stays the same. C) It is tripled. D) It is quadrupled. E) It is reduced by a factor of two.
Orbital electrons do not spiral into the atomic nucleus because of
1) electrical forces, 2) the wave nature of the electrons, 3) angular momentum, 4) the discreteness of energy levels, 5) quantum mechanical laws, and the electrons have discrete radii from the nucleus because 6) the circumference of each orbit is an integral multiple of the electron wavelength. 7) electrical forces act over discrete distances. 8) energy levels themselves are discrete.
From the center of the Milky Way, 10- kpc-long magnetized jets of high-energy particles are emitted
Indicate whether the statement is true or false