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likoan [24]
3 years ago
15

A train on a straight track goes in the positive direction for 5.9 km, and then backs up for 3.8 km

Physics
1 answer:
kenny6666 [7]3 years ago
6 0

Answer:

2.1km

Explanation:

Ill take it as u are talking about the displacement

Since displacement has negatives and positves

5.9 - 3.8 = 2.1km

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There is a simple relationship between the energy for a photon of light Ephoton in units of eV (electron volts) and its waveleng
Eva8 [605]

Answer:

\lambda=620\ nm

E_p=1.9682\ eV

E_p=206.67\ eV is the photon energy of an x-ray

Explanation:

Given:

Energy of photon, E_p=2\ eV

Then according to given:

E_p=\frac{1240}{\lambda}

2=\frac{1240}{\lambda}

\lambda=620\ nm is the wavelength

Again,

Energy of photon, E_p=?

wavelength of the light, \lambda=630\ nm

E_p=\frac{1240}{630}

E_p=1.9682\ eV

<u>Now, photon energy for an x-ray:</u>

wavelength, \lambda=6\ nm

E_p=\frac{1240}{6}

E_p=206.67\ eV is the photon energy of an x-ray

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3 years ago
When you push something what is that force called
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An

Explanation:

If you push Force is just a fancy word for pushing or pulling.

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A 4.2 m board with a mass of 19 kg is pivoted at its center of gravity. A helium balloon attached 0.24 m from the left end of th
storchak [24]

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The torque on the board = 11.8 Nm in the anti-clockwise direction

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6 0
3 years ago
1. List a similarity between magnetic force and electrical force.
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Answer:

Both are attractive as well as repulsive.

Explanation:

(Like poles repel, like charges<em> repel</em>; unlike poles attract, unlike charges <em>attract</em>).

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What is a simple machine that has two or more simple machines working together
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