Determine the Schmidt number for ethyl alcohol flowing through a copper trough. Assume that the diffusivity of ethyl alcohol into air is 5.0 x 10-6m^2/s and into copper it is 3.0 x 10^-16m^2/s.
What will be an ideal response?
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In the Rutherford model of the hydrogen atom, a proton (mass M, charge Q) is the nucleus and an electron (mass m, charge q) moves around the proton in a circle of radius r. Let k denote the Coulomb force constant (1/4??0) and G the universal gravitational constant. The ratio of the electrostatic force to the gravitational force between electron and proton is:
A) kQq/GMmr2 B) GQq/kMm C) kMm/GQq D) GMm/kQq E) kQq/GMm
Why do sunspots appear dark?
A. They are made of different material than the surrounding gases. B. They are cooler than the surrounding gases. C. Their magnetic fields block light. D. They are hotter than the surrounding gases.
In a fusion reactor, the high temperature of the order of 108 K is required in order that what condition is met?
a. melt down the hydrogen fuel b. strip the hydrogen atoms of their electrons c. break the protons into their elementary particle sub-parts d. overcome Coulomb repelling forces between protons
A light ray is incident on the surface of water (n = 1.33) at an angle of 60° relative to the normal to the surface. The angle of the reflected wave is
a. 80°. b. 40°. c. 20°. d. 60°. e. 30°.