Una carga q se distribuye uniformemente en un volumen esférico no conductor de radio r . (a) demostrar que el potencial a una distancia a del centro, siendo ar , está dado por la siguiente expresión: v= q 3r2−a2  80 r3

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards