A pizza oven is approximated as a cubic container with upper surface heated, a door that conducts heat out, and all sides and bottom well insulated and reradiating. The inside dimensions of the oven are 1.5 m on a side. When in operation with the door closed the burner surface is at 500 K, and 3 kW of power are used by the heater. Assuming the emissivity of the heater and the inside surface of the door is 0.8, (a) determine the equilibrium temperature of the inside surface of the door and (b) if the door is opened and the room is at 30ºC estimate the equilibrium temperature of the heater, assuming that 3 kW of power is still used.
What will be an ideal response?
Referring to the sketch of the oven, the heater is surface 1 with a temperature of 500 K, an emissivity of 0.8, and a surface area of 2.25 m^2. The sides and bottom are surface 3 and are well insulated.
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The identification of "spiral nebulae" as large groupings of stars outside of our own galaxy was proven by ____
a. photographic plates made by Edwin Hubble showing stars and Cepheid variables b. the results of the Shapley-Curtis debate c. Immanual Kant's "island universe" theory d. William Parsons' observation and description of their spiral structure e. Harlow Shapley's observations of their radio spectrum
A glowing blackbody that appears bluish in color is __________ than one that appears reddish
Fill in the blank(s) with correct word
If F = 40 N and M = 2.0 kg, what is the magnitude of the acceleration of the suspended object? All surfaces are frictionless
a.
1.2 m/s2
b.
2.0 m/s2
c.
1.5 m/s2
d.
2.5 m/s2
e.
5.6 m/s2
A champion athlete can produce one horsepower (746 W) for a short period of time. If a 70-kg athlete were to bicycle to the summit of a 500-m high mountain while expending power at this rate, she would reach the summit in ____ seconds
a. 1 b. 460 c. 500 d. 1 000 e. 35 000