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n200080 [17]
3 years ago
13

I need Help with this physics question please !

Physics
1 answer:
Elena-2011 [213]3 years ago
7 0

I'll denote vectors in boldface. So the given vector field is

<em>B</em> = <em>x</em>² <em>x</em> - <em>y</em>² <em>y</em> + 3<em>z</em> <em>z</em>

<em></em>

Compute the divergence:

∇ • <em>B</em> = (∂/∂<em>x</em> <em>x</em> + ∂/∂<em>y</em> <em>y</em> + ∂/∂<em>z</em> <em>z</em>) • (<em>x</em>² <em>x</em> - <em>y</em>² <em>y</em> + 3<em>z</em> <em>z</em>)

∇ • <em>B</em> = ∂/∂<em>x </em>[<em>x</em>²] + ∂/∂<em>y</em> [-<em>y</em>²] + ∂/∂<em>z</em> [3<em>z</em>]

∇ • <em>B</em> = 2<em>x</em> - 2<em>y</em> + 3

Compute the curl:

∇ × <em>B</em> = (∂/∂<em>x</em> <em>x</em> + ∂/∂<em>y</em> <em>y</em> + ∂/∂<em>z</em> <em>z</em>) × (<em>x</em>² <em>x</em> - <em>y</em>² <em>y</em> + 3<em>z</em> <em>z</em>)

∇ × <em>B</em> = ∂/∂<em>x</em> [<em>x</em>²] (<em>x</em> × <em>x</em>) + ∂/∂<em>x</em> [-<em>y</em>²] (<em>x</em> × <em>y</em>) + ∂/∂<em>x</em> [3<em>z</em>] (<em>x</em> × <em>z</em>)

… … … + ∂/∂<em>y</em> [<em>x</em>²] (<em>y</em> × <em>x</em>) + ∂/∂<em>y</em> [-<em>y</em>²] (<em>y</em> × <em>y</em>) + ∂/∂<em>y</em> [3<em>z</em>] (<em>y</em> × <em>z</em>)

… … … + ∂/∂<em>z</em> [<em>x</em>²] (<em>z</em> × <em>x</em>) + ∂/∂<em>z</em> [-<em>y</em>²] (<em>z</em> × <em>y</em>) + ∂/∂<em>z</em> [3<em>z</em>] (<em>z</em> × <em>z</em>)

∇ × <em>B</em> = 0

(since each partial derivative not along the main diagonal vanishes, and for any vector <em>a</em> we have <em>a</em> × <em>a</em> = 0)

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Answer:

There is no mechanical advantage

Explanation:

The mechanical advantage is possible only when the force needed to lift a load is lesser than the weight of the load.

For example, is we have a mechanical advantage of 2, the force needed to lift will be 1/2 of the weight of the load, and if we have a mechanical advantage of 4, the force needed will be 1/4 of the weight of the load.

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The masses amount of a proton and neutron are 1.0087 and 1.0073 amu respectively.

<h3>What is a Proton?</h3>

This is defined as  sub atomic particle which is positively charged and is present in the nucleus while the neutron is also a particle present in the nucleus but has a neutral charge.

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The masses of neutron and proton are 1.0087 and 1.0073 amu respectively and was discovered by scientists thereby making it the most appropriate choice.

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10. A book has a mass of 400 g. The surface of the book in contact with a table has dimensions 0.10m x 0.20 m. The gravitational
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The pressure exerted on the table due to the book is 200 N/m².

The given parameters;

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  • <em>dimension of the table,  = 0.10m x 0.20 m.</em>
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The area of the table is calculated as follows;

A = 0.1 x 0.2 = 0.02 m²

The pressure exerted on the table due to the book is calculated as follows;

P = \frac{F}{A}

where;

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<em />

P =\frac{F}{A} = \frac{mg}{A} = \frac{0.4 \times 10}{0.02} = 200 \ N/m^2

Thus, the pressure exerted on the table due to the book is 200 N/m².

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3 years ago
If 230 W of power is produced in 10 seconds, how much work is done?
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Answer:

Hello There!!

Explanation:

Use this equation:Work done = Force x Distance.

Work done=230W×10s

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hope this helps,have a great day!!

~Pinky~

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Answer:

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