a) Your classroom is held at an air temperature of 20 degrees Celsius. When the outside temperature is 30 degrees Celsius in the summer, you only need to wear a t-shirt. While, when the outside temperature is -10 degrees Celsius in the winter, you need to wear a sweater. Explain why in the context of heat transfer.
b) On a winter night, you feel warm when you close the curtains. Explain.
c) Explain two heat transfer effects that result from wearing looser clothes during the winter