Why do disk stars bob up and down as they orbit the galaxy?
because the gravitational pull of other disk stars always pulls them toward the disk because of friction with the interstellar medium because the halo stars keep knocking them back into the disk

Use the table to answer question 22 23 and 24.

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

How many neutrons does plutonium -196 with an atomic number of 78.