How long would it take for a penny to fall from the top of the empire state building? the building is 381 meters.

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.

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?