At high noon, the Sun delivers 990 W to each square meter of a blacktop road. What is the equilibrium temperature of the hot asphalt, assuming its emissivity e = 1? (? = 5.67 × 10^?8 W/m2/K4)
a. 364°C
b. 637°C
c. 90.5°C
d. 181°C
e. 136°C
c
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When studying the structure of ocean waves one could look at all of the following except _______.
a. Wave length b. Tidal force c. Wave height d. Period
Two square air-filled parallel plates that are initially uncharged are separated by 1.2 mm, and each of them has an area of 190 mm2
How much charge must be transferred from one plate to the other if 1.1 nJ of energy are to be stored in the plates? (?00 = 8.85 × 10-12 C2/N • m2) A) 56 pC B) 39 pC C) 78 pC D) 3.5 µC
A 0.40-kg object, attached to a spring with spring constant k = 10 N/m, is moving on a horizontal, frictionless surface in simple harmonic motion of amplitude of 0.080 m. What is its speed at the instant when its displacement is 0.040 m? (Hint: Use conservation of energy.)
a. 17 m/s c. 3.5 cm/s b. 35 cm/s d. 6.9 cm/s
A cluster with a lot of Type O and B stars, but no bright K or M stars, is very
A) faint. B) poor in heavy elements. C) young. D) old. E) densely packed.