Evaporation takes place when matter changes from a ...
Liquid to a gas
100
Systems that are left alone tend towards a state of more, or less entropy?
More entropy
100
Why do pigs roll in the mud?
To cool off
100
On which day will the amount of water vapor in the air be greater, a summer day at 100% humidity, or a winter day at 100% humidity?
The summer day
100
Condensation occurs when matter changes from a ...
Gas to a liquid
200
Steam burns are more damaging than burns caused by boiling water
Because steam has more energy per kilogram than boiling water
200
Which would burn the most? 100kg of steam at 100C, or 100kg of boiling water at 100C?
100kg of steam
200
As a system becomes more disordered, entropy increases or decreases?
Increases
200
The first law of thermodynamics is a restatement of ...
Conservation of energy
200
Running a refrigerator with it's door open in a hot room will make the room cooler, hotter, or have no effect?
hotter
300
Which will melt a bigger hole in a block of ice -- a red hot nail tossed on it, or a red hot piece of wood of the same mass and temperature
the wood
300
In order to walk barefoot on hot coals without harming your feet, less energy would get to your feet if they were wet, dry, or soaked in gasoline?
Wet
300
Suppose the temperature of the input reservoir in a heat engine doesn't change. As the sink temperature is lowered, the efficiency of the engine ...
increases
300
Cool a sample of air from zero on the Celsius scale to near zero on the absolute scale, and the air loses
both volume and pressure
300
In buildings that are electrically heated, will turning on the lights waste energy?
No, it does not waste energy
400
Two identical blocks of iron, one at 10 degrees C and the other at 25 degrees C, are put in contact. Suppose the cooler block cools to 5 degrees and the warmer block warms to 30 degrees C. That would violate ...
The second law of thermodynamics
400
80 joules of heat is added to a system that does 55 joules of work. The internal energy change of the system is ...
25 joules
400
The ideal efficiency of a heat engine operating between 2050k and 310k is ...?
85%
400
Ice is put in a cooler to cool the food stored there. In order to speed up the cooling process you should ...
crush the ice
400
The molecules in a room-temperature glass of water jostle around at a great variety of speeds, a similar speeds, or there is no movement?
A great variety of speeds
500
Ceramic automobile engines that operate at higher temperatures would be more or less efficient?
More efficient
500
How much energy is released when 1g of steam condenses into water at 100C?
540 Calories
500
Entropy is closely tied to which of the laws of thermodynamics?
The second law of thermodynamics
500
Pull a closed plastic bag of dry air quickly down from a high elevation, and the bag of air will become cooler, or hotter?
Hotter
500
A volume of air has a temperature of 0 degrees Celsius. An equal volume of air that is twice as hot has a temperature of about ....