What is the net power that a person loses through radiation if her surface area is 1.20 m2, if her emissivity is 0.895, if her skin temperature is 300 K,
and if she is in a room that is at a temperature of 17°C? The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 • K4.
A) 60.3 W
B) 62.6 W
C) 65.7 W
D) 68.4 W
E) 64.8 W
B
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An ideal air-filled parallel-plate capacitor consists of plates that are 1.0 mm apart and have an area of 1.5 × 10-4 m2
The capacitor is connected to a 12-V potential source (battery). (?0 = 8.85 × 10-12 C2/N ? m2) (a) What is the capacitance of this capacitor? (b) How much charge is on each of its plates? (c) What is the strength of the electric field between the plates?
The angular separation of two stars is 0.1 arcseconds and you photograph them with a telescope that has an angular resolution of 1 arcsecond. What will you see?
A) The two stars will appear to be touching, looking rather like a small dumbbell. B) The stars will not show up at all in your photograph. C) The photo will seem to show only one star rather than two. D) You will see two distinct stars in your photograph.
The quantum mechanical model of the hydrogen atom requires that if the principal quantum number = 3, there will be permitted how many orbital magnetic quantum numbers?
a. 5 c. 4 b. 8 d. 7
Oceanic thermal generation operates from a relatively inexhaustible source of energy in the oceans that have heat energy from
A. subatomic heat. B. the decay of carbon in the rock formations underlying Earth's oceans. C. the energy in sunlight. D. carbon dioxide in the ozone layer.