Let the orbital radius of a planet be R and let the orbital period of the planet be T. What quantity is constant for all planets orbiting the sun, assuming circular orbits?
A) T3/R2 B) T/R2 C) T2/R D) T/R E) T2/R3
E
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Open spaces in ice crystals contribute to
A) decreased density. B) increased density. C) neither of these
The Sun appears to rotate only because Earth is revolving about the Sun
a. True b. False Indicate whether the statement is true or false
Determine the total average hemispherical emissivity and the emissive power of a surface that has a spectral hemispherical emissivity of 0.8 at wavelengths less than 1.5 ?m. 0.6 at wavelengths from 1.5 to 2.5 ?m, and 0.4 at wavelengths longer than 2.5 ?m. The surface temperature is 1111 K.
GIVEN
• A surface at temperature (T) = 1111 K
• Spectral hemispherical emittance (??)
FIND
(a) The total average hemispherical emittance, ? (T)
(b) The emissive power, E(T)
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
You would expect millisecond pulsars to be
A) isolated in space. B) part of a binary system. C) most common in open clusters. D) collapsing rapidly. E) rotating slowly.