Set 1

1. The Sun goes down, snow falls on cement playground and on asphalt road. Why does the snow on the road melt sooner than on cement?
2. Two different materials at the same temperature have different emissivities. Which one glows the brightest?
3. Why are fireplace pokers made of iron and not copper?
4. Some animals have hair which is composed of solid tubular strands, while others have hollow, air-filled tubes. Where would one more likely find the animal with hollow air-filled tubes? In cold climates, or warm?
5. In Alaska, a lack of snow allowed the ground to freeze down to a depth of about one meter, causing buried water pipes to freeze and burst. Why did a lack of snow lead to this situation?