Electricity the power p, in watts, that a circular solar cell produces and radius of the cell in centimeters are related by the square root equation

about how much power is produced by a cell with a radius of 12 cm?

While carrying a heavy box up the stairs,you set the box on a step and rest. then you pick up the box and carry it to the top of the stairs. describe these actions in terms of balanced and unbalanced forces acting on the box.