Radioactivity Basics: In positron decay, the number of protons in the nucleus is
A. decreased by 1.
B. decreased by 2.
C. increased by 1.
D. increased by 2.
E. remains unchanged.
Answer: A
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The density of air in the previous question would be __________ the density at the surface.
a. one-third b. one-half c. three times d. four times
A circuit contains two inductors of 6.0-mH inductance in parallel placed in series with an inductor of 8.0-mH inductance. After one of the 6.0-mH inductors burns out, the repairman wants to replace all three inductors with one inductor of equivalent inductance. Assuming inductors combine in series and parallel the same way resistors do, what inductance should he use?
A. 3.0 mH B. 3.4 mH C. 4.8 mH D. 11 mH E. 20 mH
An induced emf is produced in
A. a closed loop of wire when it remains at rest in a nonuniform static magnetic field. B. a closed loop of wire when it remains at rest in a uniform static magnetic field. C. a closed loop of wire moving at constant velocity in a nonuniform static magnetic field. D. all of the above. E. only (b) and (c) above.
For very small objects at very low speeds, the drag force is directly proportional to the magnitude of the velocity. The proportionality constant depends on
A) the viscosity of the fluid. B) the size of the object. C) the shape of the object. D) all of the above choices. E) none of the above choices.