A 1.5 kg rock is dropped from a height of 2.0 meters onto a spring that compresses and brings the rock to rest. (Assume no losses to thermal
energy.) How much energy is in the system before the drop.

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

What happens in a global convection cell

How do you tell if someone actually cares about you? and just say they do?