A scientist studies a model of a widely accepted theory about the universe. the model would most likely help the scientist to A- understand a theory which cannot be observed,
B- prove that the theory would not change in the future,
C-demonstrate how the theory can be changed into a law,
D- prove that all the other theories about the universe are incorrect

NEED HELP ASAP

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you

Anybody wanna ? (picture included? )

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?