The difference between a meteoroid and an asteroid is the object's:
A) size.
B) shape.
C) composition.
D) orbital period.
E) location in the solar system.
A
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A 1-m-square copper plate is placed horizontally on 2-m-high legs. The plate has been coated with a material that provides a solar absorptivity of 0.9 and an infrared emissivity of 0.25. If the air temperature is 30°C, determine the equilibrium temperature on an average clear day in which the solar radiation incident on a horizontal surface is 850 W/m2
GIVEN
• A horizontal copper plate in air
• Plate dimensions (s × s) = 1 m × 1 m
• Solar absorptance (?s) = 0.9
• Infrared emittance (?) = 0.25
• Air temperature (T?) = 30°C = 303 K
• Incident solar radiation (qs/A) = 850 W/m2
FIND
• Equilibrium Temperature (Ts)
ASSUMPTIONS
• The sky behaves as a black body at 0 K
• The effect of the legs is negligible
• Air is quiescent
• Radiative heat transfer from the bottom of the plate is negligible
SKETCH
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann constant (?) = 5.67 ? 10–8 W/(m2 K4
Waves on a String: A 90-gram wire that is 1.0 m long is under tension. When a transverse wave of frequency 890 Hz travels down the wire, its wavelength is 0.10 m and its amplitude is 6.5 mm. What is the tension in the wire?
A. 710 N B. 820 N C. 930 N D. 1000 N E. 1100 N
What is the maximum radiation pressure exerted by sunlight in space (S = 1350 W/m2) on a flat black surface?
a. 2.25 × 10^?5 Pa b. 0.06 Pa c. 7 × 10^?4 Pa d. 4.5 × 10^?6 Pa e. 9.0 × 10^?6 Pa
"Buckyball" is an allotrope of the element
a. carbon. b. oxygen. c. phosphorus. d. none of these.