2 years ago

In the unsaturated zone, the pores of the soil are totally filled with water. T or F

Physics

1 answer:

creativ13 [48]2 years ago

6 0

the answer is clearly false

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Which refers to the change of pitch heard when the source of the sound approaches and then moves away from a stationary person?

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1 year ago

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An ore car of mass 39000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 19 m lower vert

cupoosta [38]

Answer:

The compression in the spring is 5.88 meters.

Explanation:

Given that,

Mass of the car, m = 39000 kg

Height of the car, h = 19 m

Spring constant of the spring, $k=4.2\times 10^5\ N/m$

We need to find the compression in the spring in stopping the ore car. It can be done by balancing loss in gravitational potential energy and the increase in elastic energy. So,

$mgh=\dfrac{1}{2}kx^2$