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marysya [2.9K]
3 years ago
9

Rob and Mary are planning trips to nine countries this year. There are 13 countries they would like to visit. They are deciding

which countries to skip.​
show me how to solve
Mathematics
2 answers:
DENIUS [597]3 years ago
8 0

Answer:

they will skip 4

Step-by-step explanation:

Sauron [17]3 years ago
3 0

Answer:

They will have to skip the ones that are less desirable to them

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Use Hooke's Law to determine the work done by the variable force in the spring problem. A force of 450 newtons stretches a sprin
vlada-n [284]

Answer:

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Step-by-step explanation:

Given

F =450N

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Required

The work done

First, we calculate the spring constant (k)

F = kx_1

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So:

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The work done using Hooke's law is:

W =\int\limits^a_b {F(x)} \, dx

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Rewrite as:

W =15\int\limits^{60}_{30} {x} \, dx

Integrate

W =15 \frac{x^2}{2}|\limits^{60}_{30}

This gives:

W =15 *\frac{60^2 - 30^2}{2}

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Convert to Nm

W =\frac{20250Nm}{100}

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