Passive solar technologies . Group of answer choices use mirrors to concentrate the sun's rays on a tower or a series of pipes holding water use silicon wafers to generate light energy use photovoltaic cells to produce light energy use mechanical devices to heat water and buildings or electrical devices to generate electricity use the energy of sunlight without relying on electrical or mechanical devices

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

The material that keeps its new shape after it is stretched is called?

Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above