A block m1 of mass 5 kg moving at 10 m / s to the right collides with another block m2 of equal mass that was at rest on a horizontal plane without friction. Which of the following is not possible after the crash? a. M1 remains at rest and m2 is moving at 10 m/s to the right.
b. M1 moves 4 m/ to the right and m2 moves 6 m/s to the right.
c. M1 moves 2 m/s to the left and m2 moves 8 m/s to the right.
d. M1 and m2 move together 5 m/s to the right.
e. M1 moves 5 m/s to the left and m2 moves 15 m/s to the right.

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

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the tires are rotating at 0.434 rpmlinear speed=45 m/sdiameter=0.550 mradius=0.275 mnow v= rωω= v/rω=45/0.275ω=163.6 rad/sω=163.6 rad/s (1rev/2π rad) (60s/1m)ω=1563 rpm