A strong temperature gradient contributes to steep pressure gradients and this can create very strong
A) latitudes.
B) winds.
C) doldrums.
D) frictional force.
Answer: B
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A student releases a ball from rest on an inclined plane and measures that it travels a distance of 0.5 m in a time of 2.0 s. The acceleration of the ball is
A. 0.25 m/s2. B. 0.125 m/s2. C. 0.5 m/s2. D. 1.0 m/s2.
Which of the following best describes why we say that light is an electromagnetic wave?
A) The passage of a light wave can cause electrically charged particles to move up and down. B) Light can be produced only by electric or magnetic appliances. C) Light is produced only when massive fields of electric and magnetic energy collide with one another. D) The term electromagnetic wave arose for historical reasons, but we now know that light has nothing to do with either electricity or magnetism.
An interior wall of a cold furnace, initially at 0°C, is suddenly exposed to a radiant flux of 15 kW/m2 when the furnace is brought on line. The outer surface of the wall is exposed to ambient air at 20°C through a heat transfer coefficient of 10 W/(m2 K). The wall is 20 cm thick and is made of expanded perlite (k = 0.10 W/(mK), ? = 0.03 × 10–5 m2/s) sandwiched between two sheets of oxidized steel. Determine how long after startup will the inner (hot) sheet metal surface get hot enough so that reradiation becomes significant.
GIVEN • Furnace wall suddenly exposed to radiant heat flux FIND (a) How long before reradiation from the heated wall becomes significant. ASSUMPTIONS (a) Reradiation becomes significant when the reradiated flux from the exposed wall exceeds 10% of the incident radiant flux. (b) The oxidized surface of the exposed wall is black.
A gas originally occupies a volume of 0.5 m3 at a pressure of 100 kPa. It is slowly allowed to expand until the volume is 2.5 m3. Assuming the temperature is kept constant, the final pressure will be
A. 10 kPa. B. 50 kPa. C. 500 kPa. D. 100 kPa. E. 20 kPa.