As seen from Earth and the Hubble Space Telescope, Mars shows
a. a reddish color.
b. dark markings.
c. rotation.
d. white icy polar caps.
e. All of the other choices are correct.
e
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Supergiant stars are burning different fuels in several shells around the core
Indicate whether the statement is true or false
A car travels on a road that, if viewed from the side, has a semicircular bump. When at the top of the bump, the occupants of the car feel as though they weigh half their normal weight. What is the speed of the car if the radius of the semicircle is 120 m?
A. 107 m/s B. 53.7 m/s C. 34.3 m/s D. 24.3 m/s
The combustion product that is created in the largest amounts by a coal-burning generating plant is
A) acids of sulfur and nitrogen, most of which is filtered out of the exhaust gases and disposed of as solid waste. B) laughing gas, which is why Americans are so silly. C) acids of sulfur and nitrogen, which go up the plant's stack and into the atmosphere. D) carbon dioxide, which goes up the plant's stack and into the atmosphere. E) carbon dioxide, most of which is filtered out of the exhaust gases and disposed of as solid waste.
A long 0.6-m-OD 347 stainless steel (k = 14 W/(m K)) cylindrical billet at 16°C room temperature is placed in an oven where the temperature is 260°C. If the average heat transfer coefficient is 170 W/(m2 K), (a) estimate the time required for the center temperature to increase to 232°C by using the appropriate chart and (b) determine the instantaneous surface heat flux when the center temperature is 232°C.
GIVEN
• A long cylindrical billet placed in an oven
• Billet outside diameter = 0.6 m
• Thermal conductivity (k) = 14 W/(m K)
• Initial temperature (Ti) = 16°C
• Oven temperature (T?) = 260°C
• The average heat transfer coefficient h c= 170 W/(m2 K)
• Center temperature increases to 232°C
FIND
(a) The time required using the appropriate chart (b) The instantaneous surface heat fluxes when the center temperature is 232°C
ASSUMPTIONS
• Radial conduction only in billet
• Uniform and constant properties
SKETCH
