Which of the following is one of the sources of the atmospheric ozone problem?
A) coal-fired generating plants
B) cutting down forests
C) certain types of air-conditioner coolant
D) nuclear power plants
E) All of the above.
C
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Internal energy in thermodynamics is the same as
A) temperature. B) thermal energy. C) heat. D) all of the above
In many cartoon shows, a character runs of a cliff, realizes his predicament and lets out a scream. He continues to scream as he falls
If the physical situation is portrayed correctly, from the vantage point of an observer at the top of the cliff leaning over the edge, the pitch of the scream should be A) higher than the original pitch and constant. B) higher than the original pitch and increasing as he falls. C) lower than the original pitch and constant. D) lower than the original pitch and decreasing as he falls. E) It is impossible to predict.
Suppose an automobile's fuel could be made to burn hotter without harming the engine's operation. Would you still get the same amount of useful work from each gallon of gasoline?
A) It wouldn't make any difference, because the efficiency is related only to the amount of input energy, and not to the temperature of this energy. B) You would get more work, because heat engines are more efficient at converting chemical energy into thermal energy when the temperature is higher. C) You would get more work, because heat engines are more efficient at converting thermal energy into work when the input temperature is higher. D) You would get less work, because heat engines run less efficiently when the input temperature is higher. E) You would get less work, because less chemical energy would be used at the higher temperature.
What would the concentration of OH- be if the concentration of H3O+ was 1 × 10-5M?
[H3O+] × [OH-] = Kw = 1 × 10-14 A) 1 × 10-14 B) 1 × 10-5 C) 1 × 109 D) 1 × 105 E) 1 × 10-9