As a pressurized aircraft gains altitude, the difference between the outside air pressure and the pressure inside the aircraft _____________ with height
Fill in the blank(s) with correct word
increases
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Two parallel plates of infinite extent perpendicular to the page are situated relative to each other as shown in the figure. The upper plate is at 300°C and the lower plate is at 100°C. Determine the net rate of radiation heat transfer from the upper and lower plate assuming the environment is at a temperature below 100°C. Assume that both the lower surface of the upper plate and the upper surface of the lower plate are black.
GIVEN
• Two parallel plates of infinite extent perpendicular to the page.
• Upper plate temperature (T2) = 3000C
• Lower plate temperature (T1)= 1000C
• Length of the plates L1 = L2 = 2 m
• Distance between the plates (R) = 1 m
FIND
(a) Net rate of radiation heat transfer from upper and lower plate.
ASSUMPTIONS
• Lower surface of upper plate and upper surface of lower plate are black.
SKETCH
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
Equilibrium: An irregularly shaped object that is 10 m long is placed with each end on a scale. If the scale on the right reads 96 N while the scale on the left reads 71 N, how far from the left end is the center of gravity of this object?
A. 5.7 m B. 7.4 m C. 4.3 m D. 14 m
Why is the Coriolis effect so weak on Venus?
A) because Venus rotates so slowly B) because Venus is so hot C) because Venus has such a thick atmosphere D) because Venus has such a strong greenhouse effect
Assuming that features you see on Mars are similar to features found on Earth, what would a casual inspection of the interactive photo of Mars lead you to suspect about water on Mars?
A. Abundant surface water is found in large, brownish pools inside craters. B. There are numerous small streams flowing with water. C. Surface water only exists as frozen ice. D. No surface water currently exists in any form.