Materials A, B, and C have R values of 1, 4, and 8 ft2-°F-hr/Btu, respectively. If the rate of heat transfer through material A alone is 20 Btu/hr, then the rate of heat transfer through the combination of A, B and C is _____
a. 1.5 b. 2.5 c. 4.0 d. 7.0 e. 80 Btu/hr
a
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The average density of each planet in the solar system is determined by taking its mass and dividing that by its:
A) radius. B) diameter. C) surface area. D) radius squared. E) volume.
Which thermodynamic law says that you cannot convert 100 percent of a heat source into mechanical energy?
A) first law of thermodynamics B) second law of thermodynamics C) third law of thermodynamics D) law of increasing entropy
A series RLC circuit has a 100-? resistor, 2.00-mH inductor and a 4.00-?F capacitor connected across a 120-V rms ac source at (1000/?) Hz. What is the power dissipated by the circuit?
A) 184 W B) 18.6 W C) 58.4 W D) 91.8 W E) 180 W
Concentrations of ozone-eating atoms or molecules in the neighborhood of one in a thousand pose no threat to the ozone layer
What will be an ideal response?