A temperature change of 20°C corresponds to a Fahrenheit temperature change of
A) 68°F.
B) 11°F.
C) 36°F.
D) 18°F.
C
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__________is one of the gaps in the rings of Saturn that are caused by resonances with moons
A) Enceladus B) The Cassini Division C) Galileo's paradox D) The Great Red Spot
A boy throws a rock with an initial velocity of 3.13m/s at 30.0° above the horizontal. How long does it take for the rock to reach the maximum height of its trajectory if air resistance is negligibly small and g = 9.80 m/s2?
A) 0.160 s B) 0.441 s C) 0.313 s D) 0.282 s
Calculate the temperature drop from the center line to the surface for a 2.5 cm diameter rod having a thermal conductivity of 26 W/(m K) if the rate of heat removal from its surface is 1.6 MW/ m2 .
In a cylindrical fuel rod of a nuclear reactor, heat is generated internally according to the
equation
GIVEN
• A cylindrical rod with internal generation and heat removal from its surface
• Outside diameter (Do) = 2.5 cm=0.025 m
• Rate of heat generation is as given above
• Thermal conductivity (k) = 26 W/(m K)
• Heat removal rate (q/A) = 1.6 MW/m2
FIND
• The temperature drop from the center line to the surface (?T)
ASSUMPTIONS
• The heat flow has reached steady state
• The thermal conductivity of the fuel rod is constant
• One dimensional conduction in the radial direction
SKETCH
The players on Survivor need to start a fire to cook their food. One team member is farsighted, another is nearsighted. Whose glasses should they use to focus sunlight on the tinder?
A. The nearsighted person's. B. The farsighted person's. C. Either of them would work.