If you balance a broom horizontally on one finger, the center of gravity of the broom will be above your finger – closer to the bristles end than the handle end. if you saw the broom in two pieces at that point and weigh the two parts on a scale, you'll find that the heavier part is

the bristles part
the handle part
both the same weight

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.

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

Explain why electric current cannot exist if a current doesn't have a voltage source.