In an electric furnace used for refining steel, the temperature is monitored by measuring the radiant power emitted through a small hole of area 0.50 cm2. The furnace acts like a blackbody radiator
If it is to be maintained at a temperature of 1650°C, at what level should the power radiated through the hole be maintained?
39. W
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The ________ hypothesis is now the most popular to explain the Moon's origin
Fill in the blank(s) with correct word
A wood block is placed on top of the ice in a large bowl half full of ice. The bowl is then filled to the brim with water, with the wood block riding on top of the ice. As the ice melts,
a. the density of the water decreases. b. the water level falls below the rim. c. the water level rises and water spills out of the bowl. d. the water level does not change. e. the wood block descends, causing water to spill out of the bowl.
The star Betelgeuse appears red; the star Rigel appears blue. What accounts for this difference? a. Betelgeuse and Rigel have different chemical compositions
b. Betelgeuse is moving away from Earth, Rigel is moving toward Earth. c. Betelgeuse is moving toward Earth, Rigel is moving away from Earth. d. The surface of Betelgeuse is hotter than the surface of Rigel. e. The surface of Betelgeuse is cooler than the surface of Rigel.
If the z-component of the magnetic field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation
Bz(x, t) = (1.25 ?T) cos[(3800 m-1)x - (1.14 × 10-12 rad/s)t], what is the largest that the y component of the electric field can be? (c = 3.0 × 108 m/s) A) 375 N/C B) 4.17 × 10-15 N/C C) 3.75 × 108 N/C D) 4.17 × 10-9 N/C E) 1.25 × 106 N/C