Atrain leaves the station heading west on the tracks . it takes the train 8 seconds to reach 80 miles per hour . it completes the entire 160 mile trip in two hours . calculate the train's average speed and velocity over the two hour trip . show your work . identify if each of the measurements are a scalar or vector quantity.

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Which missing item would complete this alpha decay reaction ? > 228/88ra + 4/2he a.224/96 rn b. 232/90 th c. 230/92 u d. 235/92 u

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?