The filament in a light bulb has a diameter of 0.050 mm and an emissivity of 1.0. The temperature of the filament is 3000°C
What should be the length of the filament so it will radiate 60 W of power? The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 • K4.
A) 11 cm
B) 9.4 cm
C) 8.6 cm
D) 7.2 cm
E) 5.9 cm
E
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Binary star systems are very important because they allow
A. measurement of the speed of stars. B. more precise measurement of the distance of stars. C. more precise measurement of the spectral type of stars. D. more precise measurement of the temperature of stars. E. measurement of star masses.
Applying the Tragedy of the Commons principle to the human population of Earth, we might phrase it "population growth and consumption benefit the few, while the costs are borne by all of society
" What evidence is there supporting this view? What evidence is there contradicting this view?
A circuit contains a 2.0-M? resistor in series with an uncharged capacitor. When this combination is connected across an ideal battery,
the capacitor reaches 25% of its maximum charge in 1.5 s. What is its capacitance?
Igneous rock that formed on Earth's surface by solidification of lava is known as
a. extrusive rock. b. intrusive rock. c. metamorphic rock. d. silicate rock.