A body of water at 80ºF has still air at 80ºF, 14.7 psia, and 10% relative humidity above it. Estimate the evaporation rate of water into the air when the air has 20% relative humidity 3 feet above the water surface.
What will be an ideal response?
If we assume the air acts as an ideal gas and is still, so that it approximates a stagnant
column of air, then Stefan’s law may be used. Referring to the sketch,
the evaporation rate per unit area is
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Mass Sprectrometer: The figure shows a mass spectrograph that is operated with deuterons, which have a charge of +e and a mass of 3.34 × 10-27 kg. The deuterons emerge with negligible velocity from the source, which is grounded. The speed of the deuterons as they pass through the accelerator grid is 8.0 × 105 m/s. A uniform magnetic field of magnitude B = 0.20 T, directed out of the plane, is present to the right of the grid and is perpendicular to the velocity of the deuterons. The deuterons make a circular orbit in the magnetic field. What is the radius of this orbit, and what is the initial direction of their deflection just as they enter the magnetic field? (e = 1.60 × 10-19 C)
style="vertical-align: 0.0px;" height="219" width="380" /> A. 62 mm, upward B. 71 mm, upward C. 62 mm, downward D. 69 mm, downward E. 84 mm, downward
Why is it so difficult to take pictures of extrasolar planets?
A) Extrasolar planets give off light at different wavelengths than planets in our solar system. B) No telescope is powerful enough to detect the faint light from a distant planet. C) Their light is overwhelmed by the light from their star. D) Telescopes are too busy with other projects.
A glowing blackbody that appears bluish in color is __________ than one that appears reddish
Fill in the blank(s) with correct word
A car's initial velocity is 50.0 km/h in the direction 60.0° north of east, and its final velocity is 70.0 km/h in the direction 40.0° south of east. If the time period for this journey is 30.0 minutes, what is the magnitude of the car's average acceleration?
a. 186 km/h/h b. 240 km/h/h c. 92.8 km/h/h d. 3.94 km/h/h