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coldgirl [10]
3 years ago
9

When cleaning up a local beach, students found many different particles that were in the water that affected the shoreline, like

litter and gasoline. Which of the following describe how these items would need to separated from the water? Why?
A. Both gasoline and litter would need to be chemically separated from the water, because both form new bonds with the water.


B. Litter would need to be physically separated with water and gasoline would need to be chemically separated from water, because both form a mixture with the water.


C. Both gasoline and litter would need to be chemically separated from the water, because neither bonds with the water.


D. Both gasoline and litter would need to be physically separated from the water, because neither bonds with the water.


(p.s. Do teachers know about this? like fr)
Physics
1 answer:
Wewaii [24]3 years ago
4 0

The correct answer is D,

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Answer:

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Let t be the time the 2nd skydiver takes to travel, since the first skydiver jumped first, his time would be t + Δt where Δt represent the duration between the the first skydiver and the 2nd one. Remember that as t progress (increases), Δt remain constant.

Their equations of motion for distance and velocities are

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Their difference in distance are therefore:

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Similarly for their velocity difference

\Delta v = v_1 - v_2 = g(t + \Delta t) - gt

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Since g and Δt both are constant, Δv would also remain constant, their difference in velocity remain the same.

This of this in this way: only the DIFFERENCE in speed stay the same, their own individual speed increases at same rate (due to same acceleration g). But the first skydiver is already at a faster speed (because he jumped first) when the 2nd one jumps. The 1st one would travel more distance compare to the 2nd one in a unit of time.

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