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Contact [7]
3 years ago
14

What is the focal length of a lens

Physics
1 answer:
goldenfox [79]3 years ago
4 0

Answer:

The focal length of a lens is refers to the distance from the center of the lens to the principal foci.

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A 45-mH inductor is connected in series with a 60-Ω resistor through a 15-V dc power supply and a switch. If the switch is close
egoroff_w [7]

Answer:

The current is 0.248 A

Explanation:

Given that,

Inductor L= 45\times10^{3}\ H

Resistance R= 60\Omega

Voltage = 15 volt

Time t =7.0\times10^{-3}\ sec

We need to calculate the current

Using formula of current

I=\dfrac{V}{R}(1-e^{\dfrac{-R}{L}}t)

Where, V = voltage

R = resistance

L = inductance

T = time

Put the value into the formula

I=\dfrac{15}{60}(1-e^{\dfrac{-60}{45\times10^{3}}}\times7\times10^{-3})

I=0.248\ A

Hence, The current is 0.248 A.

4 0
3 years ago
Greg is giving a slide show presentation to a large audience. How might a laser best help him with the presentation?
gizmo_the_mogwai [7]

Explanation :

The full form of laser is Light Amplification by Stimulated Emission of Radiation. It has particles of very high energy. It points in one direction.

Greg is giving a slide show presentation to a large audience. It is very important to make the presentation informative. By using a laser, we can focus on the important part of the presentation. So that we can highlight the important points.

3 0
3 years ago
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prisoha [69]
Solid has vibrating molecules that barely move to keep it's shape

liquid moves at an average speed and keeps it's volume but not it's shape

gases move quickly and all over the place so they don't have a shape or volume

plasma is the quickest moving and is like a gas
5 0
3 years ago
The 1811-1812 new madrid earthquakes were different from most california earthquakes because
g100num [7]

Answer:

New Madrid earthquakes are centered in a plate interior, meaning they were intraplate earthquakes.

Explanation:

The 1811-1812 new madrid earthquakes were different from most california earthquakes because the New Madrid earthquakes were centered in a North American plate interior caused by stress within the plates.

The New Madrid earthquakes often referred to as the "Tecumseh's Comet" was the biggest earthquake in America history.

4 0
3 years ago
55N of force are applied onto a table, but the force of friction is 8N. What is the net force acting on the table? Please explai
nirvana33 [79]

Answer:

get a tutor or something to help man

Explanation:

8 0
3 years ago
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