Distilled water at 75ºF is suddenly exposed to oxygen gas at 75ºF. Determine the time before the oxygen concentration in the water is 0.1% by mass at a point 0.05 inches below the surface of the distilled water.
What will be an ideal response?
This is a transient convection mass transfer problem and can be modelled as a semiinfinite
solid (liquid, in this case) with a rapid boundary condition change. The use of
Equation 8-59 is appropriate here.
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a. the movement of magnetic particles. b. the movement of electric charge. c. Earth's magnetic field. d. the movement of magnetic charge.
If the earth were twice as far from the sun as it presently is, how long (in terms of the present year) would it take it to make one orbit around the sun?
A) 2.0 years B) 2.8 years C) 4.0 years D) 5.7 years E) 16 years
If you were standing on a cart that was at rest and free to roll (ignore friction) and someone threw a 10 kg ball at you, you would
A. roll backward faster if you caught the ball higher above the ground. B. roll backward faster if the ball bounced off of you elastically. C. not move if you caught the ball because you are more massive than the ball. D. roll backward faster if you caught the ball.
(b) Two identical particles with equal speeds, one moving east and one moving west, collide. After the collision, the same particles move north and south, respectively, with the same speeds that they had originally.
A. C B. F