An “empty” steel barrel with its lid off has some gasoline remaining in the bottom, as shown. If the vapor pressure is 1 psia, estimate the evaporation rate of the gasoline and its vapor pressure half-way up in the barrel. Assume the mass diffusivity of gasoline into air is 0.0094 ft^2/s and assume that the vapor pressure of the gasoline is zero at the top.
Assuming that the air column in the barrel is stagnant and that the air and the gasoline
in the column behave as ideal gases. Then Stefan’s law may be used.
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Mercury has only a trace atmosphere because
A. its slow rotation allows atmospheric gases to escape the planet. B. its close proximity to the Sun allows the Sun to gravitationally pull gases directly off the surface of Mercury. C. impacts from planetesimals caused its original atmosphere to evaporate away. D. its smaller size means it has gravitational attraction that is too weak to hold onto an atmosphere.
A light source blinks with a certain frequency in its own frame of reference, and the speed of light in that frame is c. When the light source approaches you, you observe an increase in
A) both speed of light and frequency of blinking. B) speed of light, but not frequency of blinking. C) frequency of blinking, but not speed of light.
Helium-neon laser light (? = 6.33 × 10?7 m) is sent through a 0.30-mm-wide single slit. What is the width of the central maximum on a screen 1.0 m from the slit?
A. 2.0 cm B. 4.2 mm C. 1.1 cm D. 2.0 mm E. 0.70 mm
A body of mass 5.0 kg is suspended by a spring which stretches 10 cm when the mass is attached. It is then displaced downward an additional 5.0 cm and released. Its position as a function of time is approximately
a. y = ?0.10 sin 9.9t. b. y = 0.10 cos 9.9t. c. y = ?0.10 cos (9.9t + 0.1). d. y = 0.10 sin (9.9t + 5). e. y = ?0.05 cos 9.9t.