Which objects should be included within the system in order to make an energy analysis as easy as possible

What is the mass of the same rock on the earth

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

The temperature at a point (x, y) is t(x, y), measured in degrees celsius. a bug crawls so that its position after t seconds is given by x = 6 + t , y = 8 + 1 3 t, where x and y are measured in centimeters. the temperature function satisfies tx(3, 9) = 5 and ty(3, 9) = 4. how fast is the temperature rising on the bug's path after 3 seconds? (round your answer to two decimal places.)