3 years ago

Porque un pájaro eriza sus plumas

Physics

1 answer:

PolarNik [594]3 years ago

3 0

Answer:

¿Qué estás intentando hoy?

Explanation:

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calculate the work done in kilo joules in lifting a mass of 20kg at steady velocity through a vertical height of 20m

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Answer:

$\huge\boxed{\sf Work\ done = 4 kJ}$

Explanation:

Since work done is in the form of potential energy, we will use the formula of potential energy here.

We know that,

Where,

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So,

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$\rule[225]{225}{2}$

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Answer:

0.5 eV

Explanation:

$E_1$ = Initial potential energy = $2\ eV$

$E_2$ = Final potential energy

$L_1$ = Initial width

$L_2$ = Final width = $2L_1$

Energy of an electron in a one-dimensional trap is given by

$E=\dfrac{n^2h^2}{8mL^2}$

From the equation we get

$E\propto \dfrac{1}{L^2}$

So,

$\dfrac{E_1}{E_2}=\dfrac{L_2^2}{L_1^2}\\\Rightarrow E_2=\dfrac{E_1L_1^2}{L_2^2}\\\Rightarrow E_2=\dfrac{2L_1^2}{4L_1^2}\\\Rightarrow E_2=0.5\ eV$

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3 years ago

What allows a metal to be pounded into a flat shape?

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