3 years ago

On a guitar if you hit the harder you strike the string the:

Physics

1 answer:

Sedaia [141]3 years ago

6 0

It will get louder A)

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D loud sound

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A student does 25 J of work on the handle of a pencil sharpener. If the pencil sharpener does 20 J of work on the pencil, what i

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80%

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Work input = 25J.

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Work is done by the heart on the blood during this time is 0.04 J

Explanation:

Given :

Mass of blood pumped, m = 80 g = 0.08 kg

Initial speed of the blood, u = 0 m/s

Final speed of the blood, v = 1 m/s

Initial kinetic energy of blood is determine by the relation:

$E_{1}=\frac{1}{2} m u^{2}$

Final kinetic energy of blood is determine by the relation:

$E_{2}=\frac{1}{2} m v^{2}$

Applying work-energy theorem,

Work done = Change in kinetic energy

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$W=\frac{1}{2} m (v^{2}-u^{2})$

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3 years ago