Ethel throws a rock downward, and air resistance is negligible. compared to a rock that is dropped, the acceleration of the thrown rock (after it is thrown) is

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.

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine