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No. It depends on the context. If you are studying solar gain in a building then the room temperature is a dependent variable. If you are studying the effects of diseases, the body temp is a dependent variable.
The answer to the question depends on what it is that you are trying to study.
A solar water heater is typically shaped like a rectangular prism or a cylinder. The rectangular prism shape is common for flat-plate solar collectors, while the cylinder shape is often used for evacuated tube solar collectors. Both shapes maximize the surface area exposed to sunlight to efficiently heat water using solar energy.
Not according to my Windows 7 (and my basic solar powered calculator) it doesn't !Both of them give the answer 3.464101616 - which is correct !But how can anybody trust a machine to give him an answer that he can't calculatefor himself ?It's true that the first number multiplied by 2 does not equal the second number specified in the question.But the first number to the second power (squared) is the same as the second number in the question.At least as far as my solar powered calculator is concerned.
A dyson sphere could never be built. However space based solar power stations could be built with the help of space elevators, space fountains & launch loops. Space based solar power stations will reduce the effect of global warming due to the expansion of the sun into a red giant & also space based solar power stations could help to power laser powered vehicles.