The heat we enjoy on a sunny day is due mainly to the Sun's
A) high surface temperature.
B) relatively close distance.
C) enormous size.
D) none of the above
Answer: C
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Based on your study of the Interactive Figure, which of the following is not one of the four major features of the solar system?
Mercury has "weird terrain" directly opposite its huge Caloris Impact Basin
Indicate whether the statement is true or false
Meters: A galvanometer with a coil resistance of 80 ? deflects full-scale for a current of 2.0 mA. What series resistance is required to convert it to a voltmeter reading full scale for 200 V.
A. 100 m? B. 0.80 m? C. 13 M? D. 250 k? E. 100 k?
A 1-cm-thick, 1-m-square steel plate is exposed to sunlight and absorbs a solar flux of 800 W/m2. The bottom of the plate is insulated, the edges are maintained at 20°C by water-cooled clamps, and the exposed face is cooled by a convection coefficient of 10 W/(m2 K) to an ambient temperature of 10°C. The plate is polished to minimize reradiation. Determine the temperature distribution in the plate using a node spacing of 20 cm. The thermal conductivity of the steel is 40 W/(m K).
GIVEN
Square plate with water-cooled edges exposed to solar flux
FIND
(a) Temperature distribution in the plate
ASSUMPTIONS
(a) Neglect temperature gradients through the plate thickness
SKETCH
