A cylindrical metal shell has an inner radius A, an outer radius B, and a very long length L. The shell has total net charge of Q placed on it. Assume that L >> B > A so that any charge on the ends can be ignored.
What is the charge density on the outer shell and what is the charge density on the inner shell?
In other words, what is: σouter ; σinner ?

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

What is the measurement of how fast an object moves relative to a reference point?

A58-kg boy swings a baseball bat, which causes a 0.140-kg baseball to move toward third base with a velocity of 38.0 m/s.