The lowest places on Earth's surface are called ______________ trenches
Fill in the blank(s) with correct word
deep-sea
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The acceleration (or deceleration) of the expansion of the universe is determined by
a. the standard matter, baryons and leptons. b. the dark matter in the universe. c. the dark energy in the universe. d. all of the above. e. only (b) and (c) above.
Heavy nuclei are unstable because
a. each nucleon is a separate particle that is not acted on by the nuclear force. b. there are not enough protons present relative to the number of neutrons for the electrical force to be strong enough. c. the nuclear force dominates the Coulomb repulsive force at distances less than 2 fm, but falls off rapidly at greater distances. d. nuclei are stable only when the number of neutrons equals the number of protons. e. nuclei are stable only when the number of protons exceeds the number of neutrons.
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T that are perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A
A solenoidal inductor for a printed circuit board is being redesigned. To save weight, the number of turns is reduced by one-half, with the geometric dimensions kept the same. By how much must the current change if the energy stored in the inductor is to remain the same?
1.It must be four times larger. 2.It must be two times larger. 3.It should be left the same. 4.It should be one-half as large. 5.No change in the current can compensate for the reduction in the number of turns.