Q. Why is path AB parallel to x- axis?
[It's due today!!]

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.

What makes thermal imaging cameras useful? they can detect differences in color. they can detect differences in wave speeds. they can detect differences in temperature. they can detect mechanical waves.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?