Which of the following processes did not contribute gas to Earth's secondary atmosphere?
a. volcanism
b. accretion
c. oxidation
d. comet impacts
e. All of the above contributed gases to Earth's secondary atmosphere.
c. oxidation
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A 12-L volume of oil is subjected to a pressure change, which produces a volume strain on the oil of -3.0 × 10-4. The bulk modulus of the oil is 6.0 × 109 N/m2 and is independent of the pressure
By how many milliliters does this pressure reduce the volume of the oil? A) 2.0 mL B) 2.4 mL C) 2.8 mL D) 3.2 mL E) 3.6 mL
Which gases are added to Earth's atmosphere by volcanic eruptions?
A. carbon dioxide, ozone, and methane B. carbon dioxide, water vapor, and nitrogen C. nitrogen, oxygen, and ammonia D. ammonia, methane, and oxygen
True or False: If you were traveling in a spaceship at a speed of c/2 relative to Earth and you fired a laser beam in the direction of the spaceship’s motion, the light from the laser would travel at a speed of 3c/2 relative to Earth
1.False 2.True
The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of 1.8 m2 (0.6m x 3m) with a heat transfer coefficient of 255 W/(m2 K). On the other side of the heat exchanger wall flows a gas, and the wall has 96 thin rectangular steel fins 0.5-cm-thick and 1.25-cm- high [k = 3 W/(m K)]. The fins are 3-m-long and the heat transfer coefficient on the gas side is 57 W/(m2 K). Assuming that the thermal resistance of the wall is negligible, determine the rate of heat transfer if the overall temperature difference is 38°C.
GIVEN
FIND
The rate of heat transfer (q)
ASSUMPTIONS
The thermal resistance of the wall is negligible
The heat transfer through the wall is steady state
The thermal conductivity of the steel is constant
SKETCH
