What is a temperature inversion?
What will be an ideal response?
Answer: A temperature inversion is the condition occurring when the upper regions of the air (or atmosphere) are warmer than the lower regions. The air above acts like a blanket on the air below and does not allow the air to mix. A temperature inversion traps smog and other thermal pollutants.
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What is the binding energy per nucleon of 197Au (atomic number = 79)? (The following information regarding atomic masses will be needed: 197Au, 196.966 543 u; hydrogen, 1.007 825 u; neutron, 1.008 665 u; also 1 u = 931.5 MeV/c2)
a. 931 MeV b. 745 MeV c. 7.92 MeV d. 1870 MeV
Two metal rods, one silver and the other gold, are attached to each other end-to-end. The free end of the silver rod is immersed in a steam chamber at 100°C,
and the free end of the gold rod in an ice water bath at 0°C. The rods are both 5.0 cm long and have a square cross-section that is 2.0 cm on a side. No heat is exchanged between the rods and their surroundings, except at the ends. How much total heat flows through the two rods each minute? The thermal conductivity of silver is 417 W/m ? K, and that of gold is 291 W/m ? K. A) 8.2 kJ B) 9.5 kJ C) 12 kJ D) 14 kJ E) 16 kJ
As a system loses the ability to do work, its entropy decreases
Indicate whether the statement is true or false
The acceleration due to the Earth's gravity, in English units, is 32 ft/s2. In the absence of air friction, a ball is dropped from rest. Its speed on striking the ground is exactly 60 miles/hr. For what time interval was the ball falling? (There are 5280 feet in one mile.)
A. 5 s B. 2.75 s C. 4.125 s D. 6.1 s