An AC voltage source, with a peak output of 120 V, results in dissipation of energy in a resistor at rate of 50.0 W. What is the value of the resistance?
a. 100 W
c. 144 W
b. 120 W
d. 72.0 W
C
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The Hoover Dam is 726 feet high. What is its height in kilometers?
A) 0.726 kilometers B) 0.525 kilometers C) 0.221 kilometers D) 0.275 kilometers E) 0.138 kilometers
A girl throws a rock horizontally with a speed of 12 m/s from a bridge. It falls 2.28 s before hitting the water below. Neglect air resistance
(a) How high is the bridge from the water below? (b) How far horizontally does the rock travel before striking the water?
During retrograde motion, a planet moves from ________ to ________ relative to the stars.
A. west; east (moves eastward) B. east; west (moves westward)
Which of the following analogies best describes how the structure of the galaxy's spiral arms is maintained?
A) Like military jets flying in formation above a football stadium, the stars in the spiral arms keep a spiral-shaped formation as they orbit the galaxy. B) Like cars slowing in traffic to look at an accident, stars slow as they pass through the spiral arms. C) Like a coiling rope, the spiral arms wind up tighter with every galactic rotation. D) Like the fins of a giant pinwheel toy, the spiral arms carry a set of bright stars around as they sweep through the galaxy.