An elevator provides 21 000 w of power during a 12 s ride. how much work does the elevator do?

The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5. what is the specific heat ratio? show the math steps .

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference

What are similarities and differences between refraction, reflection, diffraction and absorption?