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Fofino [41]
4 years ago
15

An unusual lightning strike has a vertical portion with a current of −400 A downwards. The Earth's magnetic field at that locati

on is parallel to the ground and has a magnitude of 30 μT. Calculate, in N, the force exerted by the Earth's magnetic field on the 25-m-long current.
Physics
1 answer:
Xelga [282]4 years ago
4 0

Answer:

0.3 N

Explanation:

i = 400 A

B = 30 x 10^-6 T

L = 25 m

Force due the current carrying conductor placed in a magnetic field

F = B i L SinФ

where, Ф be the angle between length vector and magnetic field vector

F = 30 x 10^-6 x 400 x 25 = 0.3 N

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hallar un numero de dos cifras sabiendo que la suma de las cifras es 12 y que la primera de ellas es el triple de la segunda
Natali [406]

Answer:

93 o 39.

Explanation:

Hola.

En este caso, podemos resolver este problema por medio del planteamiento de las siguientes ecuaciones:

1. Definimos <em>x</em> como el primer dígito y <em>y</em> como el segundo, por lo tanto, como su suma es 12, escribimos:

<em>x</em> + <em>y</em> = 12

2. Ahora, dado que el primer dígito, x es el triple del segundo, escribimos:

<em>x</em> = 3 <em>y</em>

De este modo, podemos resolver para <em>y</em>:

3 <em>y</em> + <em>y</em> = 12

4 <em>y</em> = 12

<em>y</em> = 12 / 4

<em>y</em> = 3

Y para <em>x</em>:

<em>x</em> = 3 <em>y</em>

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Así, el número puede ser 93 o 39.

¡Saludos!

3 0
3 years ago
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