Which uses combustion by moving pistons, which respond to a change in pressure? heat engine
furnace
refrigeration unit
heat pump

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Groups of organs that work together to complete a process in the body are called: a. cells b. tissues c. nerves d. systems

The substances that are necessary for producing of certain hormones and that store and transport vitamins

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?