Imagine that you are designing a small car and you want to make it as safe as possible. There are two ways that you can design the car for a collision. One is to make it so that the car will crumple up (keeping the passenger compartment rigid so they don’t get squashed!) and come to rest along with the other vehicle. The other method is to make the car very rigid so that it will bounce off of the other vehicle. Which method will be safer to use?

A. The crumple method, because the force experienced by the passengers will be less in this case.

B. The crumple method, because the car absorbs all the forces that would otherwise act on the person.

C. The rigid method, because the rigid body sends the forces back to the other car.

D. The rigid method, because the rigid body carries the impulse away from the passengers.

E. Both are equally effective.

B. The crumple method, because the car absorbs all the forces that would otherwise act on the person.

Explanation:

The impact forces transmission to passengers needs to be minimized in order to achieve the highest safety level, hence in the case of a collision, car will crumple and absorb most part of that force and will not cause harmful sudden deceleration.

speed

ratio of distance traveled to time interval

net force

vector sum of forces on object

object

source of diverging light rays either luminous or illuminated

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explanation:

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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