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trapecia [35]
3 years ago
15

If the total number of earthquakes annually averages 14,500 approximately how many are magnitude 5 or higher? and show work.

Physics
1 answer:
madreJ [45]3 years ago
8 0
  <span>To take a percentage of a number out, simply do the follow: 
Number x Percentage = Answer. 

Therefore: 
14,500x(90/100)=13,050 

To find what percentage a figure represents of a total, do the following simple equation: 
Figure/Total x100 = Percentage. 

So for your Earthquakes, you have a total of: 
Total = 90 + 20 + 5 + 1 = 116 Earthquakes. 

4 to 5 -> 90/116 x100 = 78% to 2 sig. fig. 
5 to 6 -> 20/116 x100 = 17% 
6 to 7 -> 5/116 x100 = 4% 
7+ -> 1/116 x100 = 1% 


</span>The same technique is used everywhere else, sample size divided by total multiplied by 100 gives percentage. Not multiplying by 100 gives you a ratio of 1 that it represents, 1 being 100% (a complete unit). 
<span>Therefore for part 1. of your question I would just do 14,500x0.9=13,050. </span>
<span>You'll probably see that 90/100 = 0.9 since 90% is identical to writing 90/100 or 0.9.</span>
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2 years ago
A boy throws a baseball onto a roof and it rolls back down and off the roof with a speed of 3.05 m/s. If the roof is pitched at
vekshin1

1) Time in the air: 0.78 s

The motion of the ball is a projectile motion, which consists of two independent motions:

- A horizontal motion with constant horizontal velocity

- A vertical motion with constant downward acceleration of

g=-9.8 m/s^2 (acceleration of gravity)

The initial vertical velocity is

u_y = u sin \theta = (3.05)(sin(-40^{\circ}))=-1.96 m/s

where the negative sign means the direction is downward.

The vertical position of the ball is given by

y(t) = h + u_y t + \frac{1}{2}gt^2

where

h = 4.50 m is the initial heigth of the ball when it starts falling down

The ball reaches the ground when y = 0, so we have:

0 = 4.50 -1.96t-4.9t^2

This is a second-order equation; solving for t, we get

t = -1.18 s

t = 0.78 s

We discard the negative solution since it has no physical meaning, so we can say that the ball spent 0.78 s in the air.

2) Horizontal distance: 1.83 m

For this second part of the problem, we just have to consider the horizontal motion of the ball.

As we said previously, the motion of the ball along the horizontal direction is a uniform motion with constant velocity, which is given by

v_x = u cos \theta = (3.05)(cos (-40.0^{\circ}))=2.34 m/s

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For a uniform motion, we can use the following relationship between distance covered and velocity:

d=v_x t

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d=(2.34)(0.78)=1.83 m

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3 years ago
Is the classification for an instrument that produces sound whne a string or strings stretched between two points is plucked?
Yuki888 [10]
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Answer:

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P = \dfrac{815}{4.5\times 10^{-2}}\ N/m^2

P=181.11 x 10²  N/m²

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