Question

give reasons for following 1) a new quilt is warmer than old one 2) the bottom of cooking utensils are often kept black 3) a brass tumbler Feels much cooler than a wooden tray on a Chilly day

Answer 1

1 ) new quilt is warmer than the old one because new one has air space between the woolen layers.these spaces traps air ,as air is a insulator they do not allow the body heat to escape and keep us warm.

2) black is a good conductor of heat and the bottom of the vessels are black because it helps to absorb more heat and thus help in cooking the food faster and top part is shinny so that minimum heat is lost.

3) brass is a metal so,it is a good conductor  thermal .but wood is a insulator.

Answer 2

Answer:

1. heating the rims expand . And can easily lie down on the wheel it cools.