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,

Physics & Space Science

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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

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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.

Physics & Space Science

By what process does the Sun generate energy?

A) nuclear fusion B) chemical reactions C) nuclear fission D) gravitational contraction E) gradual expansion

Physics & Space Science

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

Physics & Space Science