Asolar thermal plant with energy storage capability is to be constructed at about a 40° latitude to provide the electric energy to a system whose 24-hr average load is 100 mwe during the winter. assume that the solar thermal power plant will have a 25% energy conversion efficiency; that the nighttime load is 40% of the total load; and that 10% of the energy that must be stored is lost. (a) determine the total land area (in km2) required for the reflectors (heliostats). (b) for comparison also determine the area (in km2) required for a fixed horizontal system. in both cases, it is believed that a parabolic reflector system can be set up so that the reflectors cover 45% of the land area on which they are placed. the reflected energy collected at 40° latitude in winter is 6 kw·hr/m2·day for a tracking system, and only 1.85 kw·hr/m2·day for a horizontal fixed system.
that statement is almost always false. when anything is heated, it expands with one tiny exception.
when water is heated from 0°c to 4°c, it contracts. i'm pretty sure that this is the only place in nature where this exception to the rule occurs. if it didn't, then life on earth wouldn't be possible !
here at the moment when bullet strikes the block it will have no external force on it
so here we can use momentum conservation
so we will have
so they move together with speed 1.98 m/s