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.

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.

Awalk up the phase change graph worksheet

In the nineteenth century, gregor mendel first determined some basic rules of genetics that have been observed throughout all types of life. no observations have disproved these basic rules of genetics. charles darwin developed the idea of biological evolution around the same time, but he was unaware of mendel’s discoveries in genetics. over a century later, darwin’s idea of evolution was modified in order to incorporate mendel’s rules of genetics along with the other evidence that darwin had used. what is most likely the relationship between mendel’s rules of genetics and darwin’s idea of biological evolution? a.)mendel’s genetics states laws that are now part of the theory of biological evolution.b.)biological evolution states laws that are part of mendel’s theory of genetics.c.)mendel’s genetics replaced darwin’s entire concept of biological evolution.d.)biological evolution is a law that explains why all genetics exist.