Asatellite orbits a planet once every 72 hours and carries a photovoltaic panel of area 2 m2 and efficiency 13 %. throughout the orbit of the satellite, the panel remains horizontal with respect to the surface of the planet directly below it. the orbit of the satellite is circular and lies in a plane that includes a line drawn between the center of the star and the center of the planet. on board the satellite, the photovoltaic panel is used to charge a battery which supplies a continuous electrical load requiring constant power p. estimate what value of p could be supplied if, instead of remaining horizontal, the panel were constantly orientated towards the star. calculate also the battery capacity required in this case.