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Studentka2010 [4]

2 years ago

7

What is 2/5 ÷ 2/3 i need help

2 answers:

ki77a [65]2 years ago

5 0

Answer:

0.6

Step-by-step explanation:

KonstantinChe [14]2 years ago

5 0

Answer:

0.6

Step-by-step explanation:

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What is x-x? <br> Anyone who answers that in 7 minutes will be given marks

Westkost [7]

Answer:

0

Step-by-step explanation:

x and x are same terms.

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geniusboy [140]

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Step-by-step explanation:

the slope of a parallel line is the same

pls mark brainliest

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3 years ago

Find the volume of the cylinder. Use 3.14 for π. Round to the nearest tenth.

lakkis [162]

Answer:

62.8 m^2

Step-by-step explanation:

The volume of a cylinder is given by

V = pi r^2 h where r is the radius and h is the height

V = (3.14) ( 2)^2 *5

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2 years ago

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Olivia thinks of a number she multiplies her number by 6 and gets an answear of -54 what was her original number

erastovalidia [21]

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7 0

3 years ago

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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:

The work done is 202.50Nm

Step-by-step explanation:

Given

$F =450N$

$x_1 = 30cm$

$x_2 = 60cm$

Required

The work done

First, we calculate the spring constant (k)

$F = kx_1$

$450N = k *30cm$

$k = \frac{450N}{30cm}$

$k =15N/cm$

So:

$F = kx_1$

$F(x) = 15x$

The work done using Hooke's law is:

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

This gives:

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

Rewrite as:

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

Integrate

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

This gives:

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

$W =15 *\frac{2700}{2}$

$W =15 *1350$

$W =20250N-cm$

Convert to Nm

$W =\frac{20250Nm}{100}$

$W =202.50Nm$

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3 years ago