"Super-Earths" may be habitable at distances much greater from their star than Earth
Indicate whether the statement is true or false
TRUE
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Explain how the specific heats of materials are measured using the technique of calorimetry
What will be an ideal response?
The kinetic energy of a pendulum is least
a. when its potential energy is least. b. at the top of its swing. c. at the bottom of its swing. d. when its total energy is greatest.
Based on current understanding, the minimum mass of a black hole that forms during a massive star supernova is roughly
A) 0.5 solar masses. B) 1.4 solar masses. C) 3 solar masses. D) 10 solar masses.
Solar radiation at 600 W/m2 is absorbed by a black roof inclined at 30°C as shown. If the underside of the roof is well insulated, estimate the maximum roof temperature in Tinf= 20°C air.
GIVEN
• Inclined roof, well insulated on the underside
• Incline angle (?) = 30 degrees
• Air temperature = 20°C
• Solar radiation absorbed (qs) = 600 W/m2
FIND
• The maximum roof temperature
ASSUMPTIONS
• The roof behaves as a black body (? = 1.0)
• The sky behaves as a black body at 0 K
SKETCH
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4).