Air within the funnel of a large tornado may have a pressure of only 0.2 atm. What is the approximate outward force on a (5 m × 10 m) wall if a tornado suddenly envelops the house? (1 atm = 1.01 × 105 N/m2.)
A. 4 × 103 N
B. 4 × 104 N
C. 4 × 105 N
D. 4 × 106 N
E. 7 × 105 N
Answer: D
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In a long, 30-cm square bar shown in the accompanying sketch, the left face is maintained at 40°C and the top face is maintained at 250°C. The right face is in contact with a fluid at 40°C through a heat transfer coefficient of 60 W/(m2 K) and the bottom face is in contact with a fluid at 250°C through a heat transfer coefficient of 100 W/(m2 K). If the thermal conductivity of the bar is 20 W/(mK), calculate the temperature at the 9 nodes shown in the sketch if the temperature distribution on the top surface of the bar varies sinusoidally from 40°C at the left edge to a maximum of 250°C in the center and back to 40°C at the right edge.
GIVEN
Square bar with one surface at fixed temperature, one surface with a specified temperature
distribution, and two surfaces with convective boundary conditions
FIND
(a) Temperature at 9 shown nodes
SKETCH
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If a = 30 cm, b = 20 cm, q = +2.0 nC, and Q = ?3.0 nC in the figure, what is the potential difference VA?VB?
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