A refrigerator condenser is a heat exchanger that converts a refrigerant from a vapor to a liquid at constant pressure and approximately constant temperature. If ammonia is used as a refrigerant and 10 kg/s is condensed at 25ºC when the surrounding temperature is 20ºC, determine the heat transfer from the refrigerant using data from the Appendix Chart C-7.
What will be an ideal response?
The heat transfer is determined from the equation
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The mass of a sulfur atom is 32.0 u, and the mass of a fluorine atom is 19.0 u. What is the mass of a mole of sulfur hexafluoride (SF6)?
A. 41.0 g B. 20.5 g C. 106 g D. 146 g E. 211 g
Power: A family goes on vacation for one week but forgets to turn off an electric fan that consumes electricity at the rate of 200 W. If the cost of electricity is 12.0¢/kW?h how much does it cost (to the nearest penny) to run the fan for the week?
Fill in the blank(s) with the appropriate word(s).
A car is 200 m from a stop sign and traveling toward the sign at 40.0 m/s
At this time, the driver suddenly realizes that she must stop the car. If it takes 0.200 s for the driver to apply the brakes, what must be the magnitude of the constant acceleration of the car after the brakes are applied so that the car will come to rest at the stop sign? A) 2.89 m/s2 B) 3.89 m/s2 C) 4.17 m/s2 D) 3.42 m/s2 E) 2.08 m/s2
To which group of polymers does Teflon belong?
a. Natural b. Hydrolytic c. Addition d. Condensation