3 years ago

When a substance changes state ____ does not change the speed of the molecules?

1 answer:

6 0

I don't understand what you are looking for. I can tell you that the speed of molecules does change during state changing.

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As the length increases, resistance increases, as a result current decreases.

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a ball is projected horizontally with a velocity of 5 m per second from the top of a building 19.6 m high how long will the ball

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A solenoid that is 133 cm long has a radius of 2.99 cm and a winding of 1740 turns; it carries a current of 3.91 A. Calculate th

erica [24]

Answer:

The value is $B = 0.0643 \ T$

Explanation:

From the question we are told that

The length of the solenoid is $L = 133 \ cm = 1.33 \ m$

The radius is $r = 2.99 \ cm = 0.0299 \ m$

The number of turns is $N = 1740 \ turns$

The current it carries is $I = 3.91 \ A$

Generally the magnitude of the magnetic field is mathematically represented as

$B = \frac{\mu_o * N * I}{L}$

Here $\mu_o$ is the permeability of free space with value $\mu_o = 4\pi *10^{-7} \ N/A^2$

=> $B = \frac{ 4\pi * 10^{-7} * 1740 * 3.91}{0.133}$

=> $B = 0.0643 \ T$

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3 years ago