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3 years ago

8

How do base-isolators, the rubber and steel pads under some buildings, reduce earthquake damage?

2 answers:

nika2105 [10]3 years ago

8 0

They absorb the energy of seismic waves.

Explanation:

Base - isolators, rubber and steel pads under buildings reduces earthquake damage by absorbing the energy of seismic waves.

Earthquakes are produced by the sudden release of energy within the earth which causes displacement and sharp movement on earth surface.
There are four main types of waves that are propagated by seismic waves which wrecks havoc.
Understanding the waves and their properties has been useful in designing earthquake resistant structures.
Base-isolators, rubber and steel pads helps to absorb seismic waves.
When seismic waves are absorbed, they are cut off.
This way they cannot cause damage.

learn more:

Earthquake brainly.com/question/6520403

#learnwithBrainly

lisabon 2012 [21]3 years ago

4 0

Answer:

D

Explanation:

it just is

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Answer:

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Explanation:

The height of the football is given by the equation:

$H = -16t^2 + V*t + S$

Using the inicial position S = 4 and the inicial velocity V = 64, we can find the time when the football hits the ground (H = 0):

$0 = -16t^2 + 64*t + 4$

$4t^2 - 16t - 1 = 0$

Using Bhaskara's formula, we have:

$\Delta = b^2 - 4ac = (-16)^2 - 4*4*(-1) = 272$

$t_1 = (-b + \sqrt{\Delta})/2a$

$t_1 = (16 + 16.49)/8 = 4.06\ seconds$

$t_2 = (-b - \sqrt{\Delta})/2a$

$t_2 = (16 - 16.49)/8 = -0.06\ seconds$

A negative time is not a valid result for this problem, so the amount of time the football is in the air before hitting the ground is 4.1 seconds.

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