Elmer learns the following facts about the sky in science class: the sky is blue because of the way the air scatters light from the sun. the colors at sunset are partly due to the fact that the sun is shining through a much thicker layer of air. adding a small amount of milk to water can cause the water to scatter light. elmer decides to use a model to see if he can recreate some of the colors of a sunset. what should he use in his model?

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2

Mackinzie walks 4 blocks west, then 2 blocks south, then 4 blocks east, and,finally, 1 block south. what is the magnitude of her total displacement duringthis walk (in blocks)?