Olbers' paradox is an apparently simple question, but its resolution suggests that the universe is finite in age. What is the simple question posed by Olbers' paradox?
A) Why is the sky dark at night?
B) What would it be like to ride on a beam of light?
C) How does the Sun produce energy?
D) Can we measure the position and momentum of an electron at the same time?
E) How many stars are in the universe?
A
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Reactance: What is the inductive reactance of a 2.50-mH coil at 1000 Hz?
A. 2500 ? B. 796 ? C. 15.7 ? D. 2.50 ?
A wheel is rotated about a horizontal axle at a constant angular rate. Next, it is rotated in the opposite direction with the same angular rate. The acceleration at a point on the top of the wheel in the second case as compared to the acceleration in the first case:
a. is in the same direction. c. is upward. b. is in the opposite direction. d. is tangential to the wheel.
A wire (length = 2.0 m, diameter = 1.0 mm) has a resistance of 0.45W. What is the resistivity of the material used to make the wire?
a. 5.6 × 10^-7 W × m b. 1.2 × 10^-7 W × m c. 1.8 × 10^-7 W × m d. 2.3 × 10^-7 W × m e. 7.1 × 10^-7 W × m
Rank the following compounds by solubility in acidic water, from most soluble to least
1) CH3CH2OH 2) CH3OCH3 3) CH3CH2NH2 A) 1, 3, 2 B) 1, 2, 3 C) 3, 2, 1 D) 3, 1, 2 E) 2, 1, 3