An 8 000-kg aluminum flagpole 100-m high is heated by the sun from a temperature of 10°C to 20°C. Find the increase in internal energy (in J) of the aluminum. (The coefficient of linear expansion is 24 × 10^-6 (°C)-1, the density is 2.7 × 10^3 kg/m3, and the specific heat of aluminum is 0.215 cal/g×°C.)
a. 7.2 × 10^5
b. 7.2 × 10^7
c. 7.2 × 10^3
d. 7.2 × 10^1
e. 7.2 × 10^2
B
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Ethyl alcohol (ethanol) is to be boiled in a vertical tube of 2 cm inside diameter. The ethanol is to be boiled at a temperature of 78.50C and a pressure of 3000 kPa when the tube inside surface temperature is 200ºC. The ethanol entering the tube may be assumed to be 10% saturated vapor, heat of vaporization, hnfg of 842 J/kg, bubble diameter of 1 mm, and bubble velocity may be taken as 0.24 m/s. Estimate the nucleate pool boiling convective heat transfer coefficient.
What will be an ideal response?
Form when hot air near the surface rises quickly through a small pocket of cooler, low-pressure air above it
A. Waterspout |
B. Tropical Cyclones |
C. Tornado |
D. Lightning |
E. Great Red Spot |
F. Dust Devil |
When atmospheric pressure increases, what happens to the absolute pressure at the bottom of a pool?
A) It does not change. B) It increases by a lesser amount. C) It increases by the same amount. D) It increases by a greater amount. E) It depends on the depth of the pool.
When we say that the speed of sound is measured under adiabatic conditions we assume that
a. the time associated with heat conduction is slow relative to the speed of the wave. b. no heat can flow between the system and its surroundings. c. the speed of the wave is directly proportional to the bulk modulus. d. the speed of the wave is proportional to the square root of the bulk modulus. e. air is an ideal gas.