A vertical outside wall of a building receives 400 W/m^2 of direct solar radiation and transfers 50 W/m^2 heat uniformly by convection to the surrounding air at 10ºC. Determine (a) vertical distance up where turbulent flow begins and (b) the wall surface temperature at this location.
What will be an ideal response?
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The inductive reactance of an RLC circuit is 36
If the frequency is doubled, what is the new inductive reactance?
A. 72
B. 36
C. 19
D. 6.0
E. 3.0
Earth's radius at the equator is larger than that at the poles. Where is Earth's surface gravity more?
A. at the equator B. at the top of Mount Everest C. at the North and South Poles D. It is the same everywhere.
A charge, +Q, is placed inside a balloon and the balloon is inflated. As the radius of the balloon r increases the number of field lines going through the surface of the balloon:
a. increases proportional to r2. b. increases proportional to r. c. stays the same. d. decreases as 1/r.
Lydia proposes to send an interstellar probe off in stages. The first stage, traveling radially outward at 0.500c relative to Earth, will send off a second stage traveling in the same direction as the first stage at a speed of 0.500c relative to the first stage. Finally, the second stage will send off a third stage traveling in the same direction at 0.500c relative to the second stage. Relative to Earth, the speed of the third stage will have a magnitude of
A. 0.500c. B. 0.800c. C. 0.929c. D. 0.972c. E. 1.500c.