# Physics 4.0

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1.
1 point
It’s often a good idea to wrap food in aluminum foil before baking it near the red-hot heating element of an electric oven. Why does this wrapped food cook more evenly?
2.
1 point
Some air fresheners are solid materials that have strong odors. If you leave these air fresheners out, they slowly disappear. What happens to the solid material?
3.
1 point
Which Law of Thermodynamics relates change in internal energy to heat added to a system and work done by it?
4.
1 point
If you drop a glass vase on the floor, it will become fragments. If you drop those fragments on the floor, however, they will not become a glass vase. Why not?
5.
1 point
Why does a pot of water heat up and begin boiling more quickly if you cover it?
6.
1 point
If you add a little hot tea to ice water at 0 °C, the mixture will end up at 0 °C as long as some ice remains. Where does the tea’s extra thermal energy go?
7.
1 point
Why does it take longer to cook pasta properly in boiling water in Denver (the “mile-high city”) than it does in New York City?
8.
1 point
Why do meats and vegetables cook much more quickly when there are metal skewers sticking through them?
9.
1 point
"The entropy of an isolated system never decreases." Which Law of Thermodynamics is this?
10.
1 point
A plant is a heat engine that operates on sunlight flowing from the hot sun to the cold earth. The plant is a highly ordered system with relatively low entropy. Why doesn’t the plant’s growth violate the second law of thermodynamics?
11.
1 point
Even on a very humid day the hot air from your blow dryer can extract moisture from your hair. Why is heated air able to dry your hair when the air around you can’t?
12.
1 point
On a bitter cold day, the snow is light and powdery. This snow doesn’t begin melting immediately when you bring it into a warm room. Why?
13.
1 point
"Two objects in thermal equilibrium with a third object are in thermal equilibrium with each other." Which Law of Thermodynamics is this?

14.
1 point
When you put a loaf of bread in a plastic bag, there is still air around the bread. Why doesn’t the bread dry out as quickly in the bag as it does when there’s no bag around it?
15.
1 point
A high-flying airplane must compress the cold, rarefied outside air before delivering it to the cabin. Why must this air be air-conditioned after the compression?
16.
1 point
Why do aluminum pans heat food much more evenly than stainless steel pans when you cook on a stove?
17.
1 point
When you throw a hot rock into a cold puddle, what happens to the overall entropy of the system?
18.
1 point
An icy sidewalk gradually loses its ice even when the weather stays cold. Where does the ice go?
19.
0 points
What is one word you would use to describe this class? If you want to write more feel free.
20.
1 point
The space shuttle generates thermal energy during its operation in earth orbit. How is it able to get rid of that thermal energy as heat in an airless environment?
21.
1 point
If you open the door of your refrigerator with the hope of cooling your room, you will find that the room’s temperature actually increases somewhat. Why doesn’t the refrigerator remove heat from the room?
22.
1 point
You’re floating outside the space station when your fellow astronaut tosses you a cold bottle of mineral water. It’s outside your space suit but you open it anyway. It immediately begins to boil. Why?
23.
1 point
Frozen vegetables will “freeze-dry” if they’re left in cold, dry air. How can water molecules leave the frozen vegetables?
24.
1 point
Explain how convection contributes to the shape of a candle flame.
25.
1 point
Use the concept of convection to explain why firewood burns better when it’s raised above the bottom of a fireplace on a grate.