The lamps in a string of Christmas tree lights are connected in parallel. What happens if one lamp burns out? (Assume negligible resistance in the wires leading to the lamps.)
A) The brightness of the lamps will not change appreciably.
B) The other lamps get dimmer equally.
C) The other lamps get brighter equally.
D) The other lamps get brighter, but some get brighter than others.
E) The other lamps get dimmer, but some get dimmer than others.
A
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A doubly charged ion (charge 2e) with velocity 6.9 × 106 m/s moves in a circular path of diameter 60.0 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion? (e = 1.60 × 10-19 C)
A) 11 × 10-27 kg B) 6.7 × 10-27 kg C) 4.5 × 10-27 kg D) 3.3 × 10-27 kg E) 8.2 × 10-27 kg
How might a nearby neighbor change the shape of this galaxy?
A. It might obliterate all life in that galaxy because of collisions between different planetary systems in the merger of the two galaxies. B. A merger with the neighbor might tighten the spiral arms and lead to a shrinking of the bulge component. C. It might make the disk of the galaxy thinner and the halo rounder. D. Small whirlpools might form in the disk of the spiral and the gas and stars would fall into them, leading to the disappearance of the disk. E. The merger of two spiral galaxies may give rise to an elliptical galaxy.
To be more effective, how should one shape the tip of a lightning rod?
A) sharpened to a point B) with a rounded tip (hemispherical) C) flat (cut off perpendicular to the rod axis)
Enzo throws a rock horizontally with a speed of 12 m/s from a bridge. It falls for 2.28 s before reaching the water below with no appreciable air resistance. Just as the rock reaches the water, find
(a) the horizontal component of its velocity. (b) the speed with which it is moving.