What is the difference between forced and free convection?
What will be an ideal response?
Forced convection heat transfer occurs when there is some outside power
source generating the fluid flow. It may be only a relative power in the sense
that the fluid flow occurs because of motion in the convecting surface. Free
convection, or natural convection is heat transfer with fluid flow because of
buoyancy of the fluid. If the fluid becomes hotter, it rises due to increased
buoyancy, and if it cools then the fluid descends.
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A 1 newton apple hangs from a tree branch. The force by the apple on Earth
A) cannot be determined from the given information, because the mass of the earth needs to be given. B) is 1 newton downward. C) is 1 newton upward. D) is zero. E) is much smaller than 1 newton, but not zero.
Pluto is smaller than many moons in the solar system
Indicate whether the statement is true or false
Suppose an elliptical galaxy is so far away that we cannot see even its brightest stars individually. Which of the following techniques might allow us to measure its distance?
A) We could use parallax. B) We could use Cepheid variables as standard candles. C) We could use a white dwarf supernova as a standard candle. D) We could use radar ranging.
How many megabytes are there in a gigabyte?
a. 10 b. 1000 c. 1000000 d. none of the above