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3 years ago

What does newton's first law describes

1 answer:

5 0

Earlier, we stated Newton's first law as “A body at rest remains at rest or, if in motion, remains in motion at constant velocity unless acted on by a net external force.” It can also be stated as “Every body remains in its state of uniform motion in a straight line unless it is compelled to change that state by forces
For example-A stationary object with no outside force will not move. With no outside forces, a moving object will not stop. An astronaut who has their screwdriver knocked into space will see the screwdriver continue on at the same speed and direction forever.

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Waves from a radio station have a wavelength of 369 m. They travel by two paths to a home receiver 20.0 km from the transmitter.

Olenka [21]

Answer:

92.25m

Explanation:

In order to solve the exercise, it is necessary to apply the concept of construtive interference due to a path difference.

The formula is given by,

$\delta = (m+\frac{1}{2})\frac{\lambda}{n}$

where,

n is the index of refraction of the medium in which the wave is traveling

$\lambda =$ wavelenght

$\delta =$ is the path difference

m = integer (0,1,2,3...)

Since in this case we are dealing with an atmospheric environment, where air is predominant, we approximate n to 1.

And since we need the reflected wave,

$\delta = 2x$

Where x is the distance in one direction without return.

The distance must correspond to the minimum therefore m = 0, so

$\delta = (m+\frac{1}{2})\frac{\lambda}{n}$

$\delta = ({0+\frac{1}{2})\frac{369}{1}$

$\delta = 184.5m$

Then the minimum distance is:

$x= \frac{delta}{2}$

$x = \frac{184.6}{2}$

$x = 92.25m$

Therefore the minimum distance from the mountain to the receiver that produces destructive interference at the receiver is 92.25m

5 0

3 years ago

The magnetic field inside a toroid is uniform.<br> a. True<br> b. False

jeyben [28]

The concept that must be applied to solve this problem is that of the magnetic field on Toroid described since the law of Ampere. Mathematically the magnetic field is determined as

$B = \frac{\mu_0 NI}{2\pi r}$

Where

$\mu_0$ = Permeability constant

N = Number of loops

I = Current

r = Radius

As we can see the magnetic field inside a Toroid is NOT uniform, since it is highly proportional to the radius. Which means that as the radius increases the magnetic field decreases.

Therefore the correct answer is: FALSE

6 0

4 years ago

A 12-volt car battery uses about 660 amps. How much power does it use?

alexira [117]

We know, Power = Voltage * Current
P = 660 * 12 = 7920 watt

In short, Your Answer would be Option A

Hope this helps!

8 0

4 years ago

Read 2 more answers

Can some one help me with this so i can bring my grade up

777dan777 [17]

Answer: