To the nearest percent, what fraction of an iceberg is submerged? (rice = 917 kg/m3, rsea = 1.03 × 10^3 kg/m3.)
a. 95%
b. 93%
c. 91%
d. 89%
e. 77%
D
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Which of the following has the shortest wavelength?
a) Visible light b) Gamma Ray c) Ultraviolet d) Radiowaves
Which of the following describes what will happen to a light ray incident on an air-to-glass boundary?
a. total reflection b. total transmission c. partial reflection, partial transmission d. partial reflection, total transmission
Two loops of wire are arranged so that a changing current in one, the primary, will induce a current in the other, the secondary. The secondary loop has twice as many turns as the primary loop. The current in the primary at this moment is 6 A and increasing. The current in the secondary must be:
a. 3 A. b. 6 A. c. zero. d. There is insufficient information to work this problem.
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.