A 44 kg person on a merry-go-round is traveling in a circle with a radius of 2 m at a speed of 4 m/s. What is the net horizontal force?

Find an expression for the electric field e⃗ at the center of the semicircle. hint: a small piece of arc length δs spans a small angle δθ=δs /r, where r is the radius. express your answer in terms of the variables q, l, unit vectors i^, j^, and appropriate constants.