Question

What temperature gradient in K/m is needed for convective
instability to occur near the surface of the Earth?

Answer #1

Interactive Solution 14.41 provides a model for problems of this
type. The temperature near the surface of the earth is 304 K. A
xenon atom (atomic mass = 131.29 u) has a kinetic energy equal to
the average translational kinetic energy and is moving straight up.
If the atom does not collide with any other atoms or molecules,
then how high up would it go before coming to rest? Assume that the
acceleration due to gravity is constant during the...

Consider a person whose exposed surface area is 1.7 m2,
emissivity is 0.9, and surface temperature is 32°C. Determine the
total rate of heat loss from that person by radiation and
convection in a large room having walls at a temperature of 18oC.
The convective heat transfer coefficient is 5 W/m2.K

What is the shape of a projectile's trajectory near the surface
of the earth, ignoring air resistance?

A star whose surface temperature is 4000 K has a peak wavelength
of 725 nm, according to Wien’s Law. If this star is in the
Andromeda Galaxy, which is moving toward Earth at about 120 km/s,
what would an observer on Earth see as the peak wavelength for this
star?

Parallax angle for a star is 195 mas. Its surface temperature is
7500 K and diameter of 4 times solar radius. Calculate apparent
magnitude , absolute magnitude, luminosity, wavelength of peak
emission and flux received on surface of the earth.

Near the surface of the Earth there is an electric field of
about 150 V/m which points downward. Two identical balls with mass
m = 0.510 kg are dropped from a height of 2.00 m, but one of the
balls is positively charged with q1 = 630 µC, and the second is
negatively charged with q2 = -630 µC. Use conservation of energy to
determine the difference in the speed of the two balls when they
hit the ground. (Neglect...

Assuming the Sun radiates as a blackbody at a temperature of
5800 K, calculate the expected surface temperature of the Earth,
assuming that the Earth also acts as a perfect blackbody. Assume
the Earth absorbs an amount of energy proportional to its
cross-sectional area, but radiates as a spherical blackbody. If the
Earth is in thermal equilibrium with outer space, then the energy
received (mostly at visible wavelengths) must equal the amount of
energy re- radiated (mostly) in the infrared....

Consider a heat engine operating between Earth's surface, at a
typical temperature of 295 K, and the bottom of a geothermal well
1.0 km deep. Given a geothermal gradient of 25 degrees C/km, what
would be the maximum possible efficiency of such a heat engine?With
your answer to the previous question, if we could tap the
geothermal flow over 10 percent of the earth's land area (excluding
the oceans) with such heat engines, roughly what percentage of
humankind's 16 TW...

Why is a temperature gradient used in gas chromatography? What
effect does increasing the temperature have on eluting
compounds?

1. What is the peak wavelength emitted by a star with a surface
temperature of 7070 K? Give your answer in nm (1 nm =
10-9 m), but enter only the numerical part in the
box.
2. By how much would a star's temperature need to increase in
order for its peak wavelength to decrease from 460 to 360 nm? Your
answer will be the change in temperature. Give your answer in K,
but enter only the numerical part in...

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