A building made with a steel structure is 650 m high on a winter day when the temperature is 0°F. How much taller (in cm) is the building when it is 100°F? (The linear expansion coefficient of steel is 11 × 10?6 (°C)?1.)
A. 71
B. 36
C. 40
D. 46
E. 65
Answer: C
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Reflected light from the Moon in a lake often appears as a vertical column when the water is
A) perfectly still. B) slightly rough. C) very rough as with churning waves.
The ____ of a gas is a measure of the average speed of the particles (atoms or molecules) in the gas
a. heat b. composition c. temperature d. blue shift e. binding energy
A long cylinder of 0.1-m-diameter has a surface temperature of 400 K. If it is immersed in a fluid at 350 K, natural convection will occur as a result of the temperature difference. Calculate the Grashof and Rayleigh numbers that will determine the Nusselt number if the fluid is
(a) Nitrogen
(b) Air
(c) Water
(d) Oil
(e) Mercury
GIVEN
• A long cylinder immersed in fluid
• Diameter (D) = 0.1 m
• Surface temperature (Ts) = 400 K
• Fluid temperature (T?) = 350 K
FIND
The Grashof number (Gr) and the Rayleigh number (Ra) if the fluid is
(a) Nitrogen (b) Air (c) Water (d) Oil (e) Mercury
ASSUMPTIONS
• The cylinder is in a horizontal position (the characteristic length is the diameter of the cylinder)
SKETCH
PROPERTIES AND CONSTANTS
The thermal expansion coefficients for oil and mercury can be estimated from
The "close encounter hypothesis" suggested that the planets formed after a near-collision between our Sun and another star. If this hypothesis were correct, which of the following would be true?
A) Planetary systems would be very rare. B) Planetary systems would be very common. C) Most planetary systems would have their jovian planets closer to their stars and their terrestrial planets farther from their stars. D) Most planetary systems would have the same number of planets as our own. E) All planetary systems would be at least 4 billion years old.