What are two important uses of petroleum

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?

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?

Which of the following is not an appropriate unit for acceleration? (kg/12 mihr? m/min/sec cm/30c?