A stratified liquid flows in an 80-cm-wide, 40-cm-high channel with the density distribution ? (y) = 800(1+ 0.2y) kg/m3 and a uniform velocity distribution of 1.2 m/s, with y measured from the bottom of the channel. The mass flux is nearest:
A) 260 kg/s
(B) 280 kg/s
(C) 300 kg/s
(D) 320 kg/s
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A semiconductor is produced by doping Group IV silicon with 1023 atoms per cubic meter of Group III gallium. Assume that at room temperature this semiconductor is in the extrinsic range of operation.
(a) What type of semiconductor is this? (b) Calculate the room-temperature electrical conductivity of this semiconductor. (c) Clearly state any assumptions you made in calculating the electrical conductivity in part (b).
Whenever a gas is compressed,
A. heat must leave the gas. B. the temperature of the gas must get smaller. C. its internal energy must get smaller. D. work must be done on the gas.
Briefly summarize current knowledge about the term flife in the equation
Number of Civilizations = NHP × flife × fcivilization × fnow. What will be an ideal response?
The movement of a glacier is fastest
A) at the bottom. B) at its surface. C) in the middle. D) along the sides.