Asolar water heater consists of a flat plate collector that is coupled to a storage tank. the collector system is as shown in pr.9.100 in the textbook, page 615. consider a collector that is 1.5 m high and 3 m wide solar collector, the back side of the collector is insulated. the absorber plate and the glass cover are spaced 5 cm from each other, are maintained at temperature of 80°c and 40°c, respectively: a) draw the schematic of the system. b) determine rate of heat transfer by convection from the absorber plate for bl ) vertical solar collector at-90° b2) tilted solar collector at t -35 b3) tilted solar collector at t-4 b4) write your comments it is recommended to construct an excel program to solve pr.5 pr.6 (30 points) a house roof (5m x 5m), inclined at an angle of 27o to the horizontal, and has an outside surface temperature of 30°c while the outside air is at 40°c: a) draw the schematic of the system. bcalculate the heat transfer coefficient between the roof

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.

answer: cellular respiration takes in food and uses it to create atp, a chemical which the cell uses for energy. usually, this process uses oxygen, and is called aerobic respiration. it has four stages known as glycolysis, link reaction, the krebs cycle, and the electron transport chain.