How is the reflection of a light ray from a plane mirror different from the
refraction of a light ray as it
enters a piece of glass?​

What type of electromagnetic wave is used in security pens? a. x-rays c. microwaves b. visible light d. ultraviolet radiation select the best answer from the choices provided

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

James joule carefully measured the difference in temperature of the water at the top and bottom of a waterfall. why did he expect a difference