Question

on a hot day, heat enters a building through a glass window, and on a cold day, heat escapes through it. how does placing a curtain over the window help reduce the change in temperature inside the building?
the curtain acts as an ____________, reducing heat transfer and slowing down temperature changes.

question 15 5 pts
which material is most suitable for making a spoon that can stir hot food without getting too hot to hold?
silver
aluminum
wood
copper

question 16 5 pts
why are metals preferred over plastics for making frying pans?
metals are lighter than plastics
metals are better conductors of heat than plastics
metals are more flexible than plastics
metals do not get hot when cooking

question 17 5 pts
in the atmosphere, what natural phenomenon is caused by convection currents?

Explanation:

First Question (Curtain and Heat Transfer)

To solve this, we recall the concept of thermal insulators. Insulators are materials that reduce heat transfer (conduction, convection, or radiation). A curtain, typically made of fabric, is a poor conductor of heat, so it acts as an insulator to slow heat transfer through the window, thus reducing temperature changes inside the building.

We need a material with low thermal conductivity (a poor heat conductor) for the spoon. Silver, aluminum, and copper are metals, which are good heat conductors (they would get hot quickly). Wood is a poor heat conductor (an insulator), so it won't get too hot to hold when stirring hot food.

Frying pans need to transfer heat efficiently to cook food. Metals are better conductors of heat than plastics. Plastics are insulators (poor heat conductors), so they can't transfer heat well. The other options are incorrect: metals are not lighter than all plastics, metals are not more flexible than plastics, and metals do get hot when cooking (they conduct heat, so the pan heats up to cook food).

Answer:

insulator

Question 15 (Spoon Material)