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Please answer ALL THREE if u can, thank you so so so so much!!!

State the formula for density in words and mathematical symbols

Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this