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3 years ago

Explain why data from at least three seismic stations are needed to locate an earthquake epicenter

1 answer:

7 0

Each station has a circle made of possible epicenters. When you have atleast 3 epicenters you can narrow it down to 1 epicenter and there's that final point. Each station can detect how far away the epicenter was (by transverve body waves). When you only have one seismic station it's impossible to locate an earthquake epicenter.

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A man pushes an 80-N crate a distance of 5.0 m upward along a frictionless slope that makes an angle of 30 with the horizontal.

laiz [17]

Answer:

The work done by the man is 260 J.

(E) is correct option.

Explanation:

Given that,

Force = 80 N

Distance = 5.0 m

Angle = 30°

Acceleration = 1.5 m/s²

Let F be the man's force

We need to calculate the force

Using balance equation

$F-mg\sin\theta=ma$

$F-80\sin30=\dfrac{80}{9.8}\times1.5$

$F=\dfrac{80}{9.8}\times1.5+80\sin30$

$F=52\ N$

We need to calculate the work done by the man

Using formula of work done

$W=F\dotc d$

$W=52\times 5.0$

$W=260\ J$

Hence, The work done by the man is 260 J.

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Elan Coil [88]

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4 years ago

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Serhud [2]

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3 years ago

Can a physical guantity have unit but is dimensionless ?

Goshia [24]

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