Calculate the proper time τ elapsed by the watch of an observer who falls radially in a Schwarzschild field starting from rest at r

a) are muscles that have bands.

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i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

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correct it is c.) b b