A thin rod of length L and uniform charge per unit length À lies along the x-axis with its center at the origin as shown in the figure below. y d P Bo -X O T -L- a. Show that the electric field at point P located a distance d from the rod has no x-component and has a magnitude equal to E = 2k Asin(80)/d. b. Use the previous result to show that if the rod has an infinite length, that its electric field has a magnitude equal to E = 2k ^/d.

P9 E4

A child does 466 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is 4.8 m above the ground. What is the mass of the box? Use g = 9.8 m/s2   Calculate to one decimal

Please answer all parts of both questions on work & energy.