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3 years ago

7

Define the meaning of the phrase entry requirements to higher education insulations and state four reasons why knowing the entry

requirements is important.

1 answer:

Arada [10]3 years ago

8 0

It's the gravity of the space lagoon

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Three ideal polarizing filters are stacked, with the polarizing axis of the second and third filters at 21 degrees and 61 degree

kvv77 [185]

Answer:

1

When second polarizer is removed the intensity after it passes through the stack is

$I_f_3 = 27.57 W/cm^2$

2 When third polarizer is removed the intensity after it passes through the stack is

$I_f_2 = 102.24 W/cm^2$

Explanation:

From the question we are told that

The angle of the second polarizing to the first is $\theta_2 = 21^o$

The angle of the third polarizing to the first is $\theta_3 = 61^o$

The unpolarized light after it pass through the polarizing stack $I_u = 60 W/cm^2$

Let the initial intensity of the beam of light before polarization be $I_p$

Generally when the unpolarized light passes through the first polarizing filter the intensity of light that emerges is mathematically evaluated as

$I_1 = \frac{I_p}{2}$

Now according to Malus’ law the intensity of light that would emerge from the second polarizing filter is mathematically represented as

$I_2 = I_1 cos^2 \theta_1$

$= \frac{I_p}{2} cos ^2 \theta_1$

The intensity of light that will emerge from the third filter is mathematically represented as

$I_3 = I_2 cos^2(\theta_2 - \theta_1 )$

$I_3= \frac{I_p}{2}(cos^2 \theta_1)[cos^2(\theta_2 - \theta_1)]$

making $I_p$ the subject of the formula

$I_p = \frac{2L_3}{(cos^2 \theta [cos^2 (\theta_2 - \theta_1)])}$

Note that $I_u = I_3$ as $I_3$ is the last emerging intensity of light after it has pass through the polarizing stack

Substituting values

$I_p = \frac{2 * 60 }{(cos^2(21) [cos^2 (61-21)])}$

$I_p = \frac{2 * 60 }{(cos^2(21) [cos^2 (40)])}$

$=234.622W/cm^2$

When the second is removed the third polarizer becomes the second and final polarizer so the intensity of light would be mathematically evaluated as

$I_f_3 = \frac{I_p}{2} cos ^2 \theta_2$

$I_f_3$ is the intensity of the light emerging from the stack

substituting values

$I_f_3 = \frac{234.622}{2} * cos^2(61)$

$I_f_3 = 27.57 W/cm^2$

When the third polarizer is removed the second polarizer becomes the

the final polarizer and the intensity of light emerging from the stack would be

$I_f_2 = \frac{I_p}{2} cos ^2 \theta_1$

$I_f_2$ is the intensity of the light emerging from the stack

Substituting values

$I_f_2 = \frac{234.622}{2} cos^2 (21)$

$I_f_2 = 102.24 W/cm^2$

7 0

3 years ago

A helicopter’s speed increases from 30 m/s to 40 m/s in 5 seconds.

TEA [102]

Acceleration is defined as the rate of change of velocity, which, simply put, is a mouthful to describe how fast something speeds up, slows down, or turns. The equation for acceleration is

a = Δv / Δt,

or your final velocity - your starting velocity, then divided by the amount of time. It can also be expressed as

a = (Vf - Vi) / t,

Where Vf is your final velocity, Vi is your initial velocity, and t is the time traveled.

The question gives us that the helicopter moves from a starting velocity of 30 m/s to a final velocity of 40 m/s in the span of 5 seconds. This means we can fill in the variables to the equation, where

Vf = 40,
Vi = 30, and
t = 5.

Plug these known variables into the original equation, and we get

a = (Vf - Vi) / t = (40 - 30) / 5.

From here, the answer comes down to 10 / 5, or 2 m/s^2.

Hope this helps! If you have any questions, don't hesitate to ask :D

6 0

4 years ago

Read 2 more answers

Discuss how the passage of time can affect the brain ? , comment on how human memory works or doesn't work. include memory kids

sergiy2304 [10]

Answer:

the stored memory undergoes important changes, as revealed by the behavioral outcomes of its retrieval.

Explanation:

6 0

3 years ago

When you drop a 0.37kg apple earth exerts a force on it that accelerates it at 9.8m/s^2 toward the earths surface. According to

Delvig [45]

force applied due to earth on the apple is given as

$F = ma$

given that

m = 0.37 kg

a = 9.8 m/s^2

now we have

$F = m*a$

$F = 0.37* 9.8 = 3.63 N$

now as per Newton's III law equal and opposite force is applied on earth

so now we can find acceleration of Earth using same equation as we used above

$F = ma$

here we know that

m = mass of earth

F = 3.63 N

$3.63 = 5.98 * 10^{24} * a$

$a = \frac{3.63}{5.98 * 10^{24}$

$a = 6.1 * 10^{-25} m/s^2$

so acceleration of earth is very small and given by above value

5 0

3 years ago

When the temperature of air rises, the amount of water needed for saturation

Oliga [24]

It Increases. I just took a quiz with the same question.

7 0

4 years ago

Read 2 more answers