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3 years ago

Unpolarized light is passed through an optical filter that is oriented in the vertical direction.

1 answer:

5 0

In order to solve this problem it is necessary to apply the concepts related to intensity and specifically described in Malus's law.

Malus's law warns that

$I = I_0 cos^2\theta$

Where,

$\theta=$ Angle between the analyzer axis and the polarization axis

$I_0 =$ Intensity of the light before passing through the polarizer

The intensity of the beam from the first polarizer is equal to the half of the initial intensity

$I = \frac{I_0}{2}$

Replacing with our the numerical values we get

$I = \frac{46}{2}$

$I = 23W/m^2$

Therefore the intensity of the light that emerges from the filter is $23W/m^2$

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There is a bell at the top of a tower that is 95 m high. The mass of the bell is 21 kg. What is the potential energy of the bell

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Answer:

19,551 J!

Explanation:

The formula is PE = ham (h=height, a= acceleration or 9.8, m= mass)

PE = (95)(9.8)(21)

PE = 19,551 Joules

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3 years ago

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3 years ago

An airplane is flying on a flight path that will take it directly over a radar tracking station. If the distance between the tra

Wewaii [24]

Answer:

The speed of planes is 419.31 miles per hours

Explanation:

Given that

$\dfrac{dS}{dt}=-400\ miles/hr$

S= 10 miles

And we have to find $\dfrac{dx}{dt}$ .

From triangle ABC

$AC^2=AB^2+BC^2$

$S^2=x^2+3^2}$

by differentiating with respect to time t

$2S\dfrac{dS}{dt}=2x\dfrac{dx}{dt}$

$S\dfrac{dS}{dt}=x\dfrac{dx}{dt}$

Now when S=10 miles then

$10^2=x^2+3^2}$

x= 9.53 miles

$S\dfrac{dS}{dt}=x\dfrac{dx}{dt}$

$10\times (-400)=9.53\times \dfrac{dx}{dt}$

$\dfrac{dx}{dt}=-419.31\ miles/hr$

So the speed of planes is 419.31 miles per hours

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3 years ago

How much GPE, in Joules, does a 126 kg object have if it is sitting on a shelf 3 meters above the

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Answer:

Ep = 3704.4 J

Explanation:

Data:

Mass (m) = 126 kg
Gravity (g) = 9.8 m/s²
Height (h) = 3 m
Potential Energy (Ep) = ?

Use formula:

Ep = m * g * h

Replace:

Ep = 126 kg * 9.8 m/s² * 3 m

Multiply, but it tells us that the units should not be used in the answer, so we solve it as follows:

Ep = 3704.4

What is the GPE?

The GPE is <u>3704.4 Joules.</u>

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3 years ago