A gray opaque surface has an emissivity of 0.8 at 400ºF. Determine the radiosity if it is irradiated at 1000 Btu/hr?ft^2.
What will be an ideal response?
The radiosity is the total radiation leaving a surface. For a gray opaque surface this is the sum of the reflected and the emitted radiation. Thus,
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One of the first tests of the general theory of relativity was the ____
a. description of the orbit of the moon b. determination of the speed of light as a constant c. change in mass of a particle moving at a high speed d. demonstration of a hammer and a feather falling at the same rate on the moon e. determination of the rate of advance of the perihelion of Mercury's orbit
The earliest evidence for life on Earth dates to
A) about 4.5 billion years ago. B) about 3.8 billion years ago. C) about 2 billion years ago. D) about 570 million years ago. E) about 65 million years ago.
By what process does the Sun generate energy?
A) nuclear fusion B) chemical reactions C) nuclear fission D) gravitational contraction E) gradual expansion
The Sun's location in the Milky Way Galaxy is ________
A) in the galactic disk, roughly halfway between the center and the outer edge of the disk B) in the halo of the galaxy, about 28,000 light-years above the galactic disk C) very near the galactic center D) at the very outer edge of the galactic disk