The period of a simple pendulum is t=2π √(l/g) with l = length of the pendulum and g = gravity of earth. a. derive the scaling law for the pendulum. b. how much would the period of the pendulum change when you decrease the characteristic dimension by a factor of 10?

d. learned preferences i believe is your answer

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.

hope this : )