In a gaseous mixture of hydrogen and oxygen, the molecules most contributing to temperature are
A) hydrogen.
B) oxygen.
C) both the same
D) not enough information
Answer: C
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A heat exchanger is to be designed to heat a flow of molten bismuth from 377°C to 477°C. The heat exchanger consists of a 50-mm-ID tube with surface temperature maintained uniformly at 500°C by an electrical heater. Find the length of the tube and the power required to heat 4 kg/s and 8 kg/s of bismuth.
GIVENS
FIND
The length (L) tube and power required (q) to heat 4 kg/s and 8 kg/s of bismuth
ASSUMPTIONS
Steady state
Uniform and constant surface temperature
Losses from the heater are negligible
SKETCH
PROPERTIES AND CONSTANTS
for Bismuth at the average bulk temperature of 427°C
What is a meteorite?
A) a streak of light caused by a star moving across the sky B) a streak of light caused by a small particle from space burning up in Earth's atmosphere C) a fragment of rock that has fallen to Earth's surface from space D) a small moon that orbits one of the jovian planets E) a comet that burns up in Earth's atmosphere
What percentage of the mass of the solar nebula consisted of elements other than hydrogen and helium?
A) 20 percent B) 0.1 percent C) 80 percent D) 0 percent E) 2 percent
A square plate has an area of 29.00 cm2 at 20.0°C. It will be used in a low temperature experiment at T = 10.0K where it must have an area of 28.00 cm2 . What area must be removed from the plate at 20.0°C for it to have the correct area at 10.0 K? (The coefficient of linear expansion is 10 × 10^?6 (°C)?1.)
a. 0.079 3 cm2 b. 0.159 cm2 c. 0.238 cm2 d. 0.836 cm2 e. 0.921 cm2