Water in a tightly closed flask evaporates at a rate of 0.00038 lbm/hr. Estimate the specific humidity of the air 1 inch above the liquid water-air surface if the dry bulb temperature is 70ºF. The water-air surface is 3 in^2.
What will be an ideal response?
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The scarcity of what isotope is a critical test of the density of the present cosmos?
A) carbon 14 B) deuterium C) helium 3 D) helium 4 E) lithium 5
Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is closed,
A. bulb 1 glows more brightly. B. bulb 2 glows more brightly. C. both bulbs continue to glow with the same brightness. D. bulb 1 goes out. E. bulb 2 goes out.
When the universe was several hundred thousand years old, matter and energy decoupled, allowing the ________ radiation to escape, expand and cool off
Fill in the blank(s) with correct word
The hydrogen spectrum has a red line at 656 nm, and a blue line at 434 nm. What is the first order angular separation between the two spectral lines obtained with a diffraction grating with 5000 rulings/cm?
a. 7.7° b. 16.6° c. 6.6° d. 3.2° e. 19.2°