Two point charges, one q and the other –q, form a dipole separated by a distance d. A third charge Q is placed midway between these two charges. If the distance between q and –q is then doubled with the Q staying midway between the other two, what happens to the force on Q?
a. It halves.
b. It reduces by a factor of 8.
c. It stays the same.
d. It quarters.
d
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What does a breeder reactor do?
a. Produces plutonium from uranium and thereby creates more nuclear fuel than it uses. b. Creates independent chain reactions that then separate from their parents and become new energy sources. c. Uses controlled rates of reaction to conserve nuclear fuel. d. Creates its own neutron bombardment beam out of the neutrons that escape from the uranium as it decays. e. Creates its own control rods out of the lead resulting from uranium decay.
The Doppler method seeks to detect planets by
A) precisely measuring distances to stars. B) directly detecting the light of planets orbiting stars. C) measuring small changes in the positions of stars on the sky. D) precisely measuring the velocities of stars moving toward and away from us. E) measuring small changes in the apparent brightness of stars.
Alcohols are distinguished by the fact that at least one hydrogen atom in a hydrocarbon has been replaced by a(n)
a. carboxyl group. b. alkyl group. c. hydroxyl group. d. oxygen atom.
A man is holding an 8.00-kg vacuum cleaner at arm's length, a distance of 0.550 m from his shoulder. What is the torque on the shoulder joint if the arm is held at 30.0° below the horizontal?
A) 21.6 Nm B) 2.20 Nm C) 4.40 Nm D) 12.6 Nm E) 37.4 Nm