2 years ago

All substances are built from

Physics

1 answer:

Greeley [361]2 years ago

6 0

An atom. Hope this helped

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Assume (unrealistically) that a TV station acts as a point source broadcasting isotropically at 3.2 MW. What is the intensity of

Dahasolnce [82]

Answer:

$I=1.5\times10^{-28}W/m^2$

Explanation:

The intensity is related to the power and surface area by $I=\frac{P}{A}=\frac{P}{4\pi r^2}$ . We need to calculate the surface area of a sphere of radius r=4.3ly.

Since 4.3ly is the distance light travels in 4.3 years at 299792458m/s, we can obtain it in meters by doing:

$r=vt=(299792458m/s)(4.3\times365\times24\times60\times60s)=4.1\times10^{16}m$

So we have:

$I=\frac{P}{4\pi r^2}=\frac{3.2\times10^6W}{4\pi (4.1\times10^{16}m)^2}=1.5\times10^{-28}W/m^2$

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2 years ago

Describe how the velocity and acceleration of a skydiver changes as she falls from the plane back to the ground

Andrews [41]

The velocity and acceleration of the skydiver will increase as she falls to the ground. According to Newton’s Law of gravity.

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What do you do if you approach a railroad crossing with a crossbuck sign that has no lights or gates

miv72 [106K]

Proceed with caution before crossing

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3 years ago

if an object 18mm high is placed 12mm from a diverging lens and the image is formed 4mm in front of the lens what is the height

brilliants [131]

To solve this problem we use an amplification formula for divergent lenses

$M = \frac{i}{o} = \frac{h'}{h}$

Where:

i: distance of the image to the lens

o: Distance from the object to the lens

h = height of the object

h '= height of the image

$M = \frac{4mm}{12mm} = \frac{h'}{18mm}$

$h'= 18mm\frac{4mm}{12mm}$

h '= 6 mm

The height is 6 mm

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2 years ago

Why do the north poles of these two magnets repel each other? A. The magnetic field that forms between the two north poles is ne

Anettt [7]

Answer: The magnetic field lines go in directions that cannot combine to form a magnetic field between the two north poles.

Explanation: that was the answer for me I just took it on ape x

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All substances are built from​

All substances are built from