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3 years ago

Help please 20 points ? ASAP

Physics

1 answer:

KengaRu [80]3 years ago

3 0

Answer:

21: Mass

22: Unbalanced Force

23: Friction

24: Balanced

Explanation:

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A 4.0 m length of gold wire is connected to a 1.5 V battery, and a current of 4.0 mA flows through it. What is the diameter of t

sladkih [1.3K]

Explanation:

Given that,

Length of gold wire, l = 4 m

Voltage of battery, V = 1.5 V

Current, I = 4 mA

The resistivity of gold, $\rho=2.44\times 10^{-8}\ \Omega-m$

Resistance in terms of resistivity is given by :

$R=\dfrac{\rho l}{A}$

Also, V = IR

So,

$\dfrac{V}{I}=\dfrac{\rho l}{A}$

A is area of wire,

$\dfrac{V}{I}=\dfrac{\rho l}{\pi r^2}$ , r is radius, r = d/2 (diameter=d)

$\dfrac{V}{I}=\dfrac{\rho l}{\pi (d/2)^2}\\\\\dfrac{V}{I}=\dfrac{4\rho l}{\pi d^2}\\\\d=\sqrt{\dfrac{4\rho l I}{V\pi}} \\\\d=\sqrt{\dfrac{4\times 2.44\times 10^{-8}\times 4\times 4\times 10^{-3}}{1.5\times \pi}} \\\\d=18.2\ \mu m$

Out of four option, near option is (C) 17 μm.

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3 years ago

In which general compass traction is this hurricane moving

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Answer:

It looks like its moving north.

Explanation:

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3 years ago

What region of the spectrum best corresponds to light with a wavelength equal to:_____ a. The diameter of a hydrogen atomb. The

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In the case of the <em>hydrogen atom</em>, we know that this is equivalent to $10^{-10}$ m on average, which corresponds to the wavelength corresponding to X-rays.

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In the case of <em>height</em>, it fluctuates in a person around $10 ^ 0$ to $10 ^ 1$ m, which falls to the wavelength of a radio wave.

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3 years ago

near the surface of the earth, objects in free fall (but not terminal velocity) experience a. constant distance. b. constant acc

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<h3><u>Answer;</u></h3>

B. constant acceleration.

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Free fall is the type of motion of a body or an object when only gravity is acting on it.
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