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3 years ago

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Two linear polarizing filters are placed one behind the other, so that their transmission directions are parallel to one another

. A beam of unpolarized light of intensity Io is directed at the two filters. What fraction of the light will pass through both filters?a.0.5 Iob.0c.2 Iod.0.25 Ioe. Io

1 answer:

yulyashka [42]3 years ago

7 0

Answer:

a.0.5 Io

Explanation:

The fraction of light passing through the first polarizer will be

$I_1=\frac{I_0}{2}=0.5I_0$

The fraction of light passing through the second polarizer will be

$I_2=0.5I_0cos^2\theta$

where

$\theta$ = Angle between the filters

here, as the transmission directions are parallel to one another

$\theta=0$

$I_2=0.5I_0cos^20\\\Rightarrow I_2=0.5I_0\\\Rightarrow I_2=I_1$

Hence, $0.5I_0$ will pass through both filters

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Speed (mph) 58 72 55 65 70 81 66 What car goes the fastest? Put the car speed in order, from fastest to slowest miles per hour.

RoseWind [281]

Answer:

The answer to your question is letter B

Explanation:

Data

Order from fastest to slowest speed

58 72 55 65 70 81 66

The fastest is 81, then, 72, 70, then, 66, 65 finally 58 and 55

The correct order

81 mi/h, 72 mi/h, 70 mi/h, 66 mi/h, 65 mi/h, 58 mi/h, 55 mi/h

The other options are from slowest to fastest or a different order.

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3 years ago

Suppose the ends of a 27-m-long steel beam are rigidly clamped at 0°C to prevent expansion. The rail has a cross-sectional area

frozen [14]

Answer:

F = 1.58*10^{11} N

Explanation:

given data:

length of steel beam = 27 m

cross sectional area of rail = 35 cm

$\Delta T = 39$ Degree celcius

change in length of steel beam is given as

$\Delta L = L_O \alpha \Delta T$

$= 20*1.1*10^{-5}*39$

$=8.58*10^{-3}$ m

Young's modulus is

$Y = \frac{FL}{A\Delta L}$

$F = \frac{ YA\Delta L}{L}$

$= \frac{2.0*10^{11}*25*10^{-4}8.58*10^{-3}}{27}$

F = 1.58*10^{11} N

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3 years ago

The mass of Earth is 5.972 x 1024 kg and its orbital radius is an average of 1.496 x 1011 m. Calculate its linear momentum, give

Anna007 [38]

Answer: its linear momentum is 1.78 × 10²⁹ kg.m/s

Explanation:

Given that;

mass of Earth m = 5.972 x 10²⁴ kg

radius r = 1.496 x 10¹¹ m

period t = 3.15 x 10⁷ s

now we know that Earth rotates in a circular path so the distance travelled per rotation is;

d = 2πr we substitute

d = 2π × 1.496 x 10¹¹ m

= 9.4 × 10¹¹ m

Now formula for speed v is;

v = d/t

we substitute

v = 9.4 × 10¹¹ m / 3.15 x 10⁷ s

v = 2.98 × 10⁴ m/s

now we determine the linear momentum p

linear momentum p = mv

we substitute

p = (5.972 x 10²⁴ kg) × (2.98 × 10⁴ m/s)

p = 1.78 × 10²⁹ kg.m/s

Therefore its linear momentum is 1.78 × 10²⁹ kg.m/s

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3 years ago

Water from Old Faithful Geyser shoots upward to a height of about 50 m once every 90 minutes. What must be the pressure in the h

Naya [18.7K]

Solution:

Given:

height of geyser, h = 50 m

speed of water at ground can be given by third eqn of motion with v = 0 m/s:

$u^{2} = v^{2} + 2gh$

putting v = 0 m/s in the above eqn, we get:

u = $\sqrt{2gh}$ (1)

Now, pressure is given by:

$\Delta p = \frac{1}{2}u^{2}\rho \\$ (2)

where,

$\Delta p$ = density of water = 1000 kg/ $m^{3}$

g = 9.8 m/ $s^{2}$

Using eqn (1) and (2):

$\Delta p = \frac{1}{2}(\sqrt{2gh})^{2}\rho$

⇒ $\Delta p = \frac{1}{2}\rho gh$

$\Delta p = \frac{1}{2}\times2\times 1000\times 9.8\times 50$ = $\Delta p$ = 490000 Pa

$p_{atm}$ = 101325 Pa

For absolute pressure, p:

p = $\Delta p$ + $p_{atm}$

p = 490000 - 101325

p = 388675 Pa

Therefore, pressure in hot springs for the water to attain the height of 50m is 388675 Pa

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3 years ago

If you have a mixture that contains the solid benzoic acid mixed with a volatile alkyl halide liquid. what is the most efficient

Goryan [66]

Fractional distillation is the most efficient technique to separate solid benzoic acid mixed with a volatile alkyl halide liquid components.

<h3>Fractional distillation :</h3>

Separating a mixture into its constituent parts, or fractions, is known as fractional distillation. Chemical compounds are separated by heating chemical mixtures to a temperature at which one or more fractions of the mixture evaporate. Distillation is used to fractionate.

Boiling a mixture of liquids results in vapors rising up a glass tube known as a "fractionating column," which is followed by separation. The fractionating column, which is placed between the flask holding the mixture and the "Y" adaptor, improves the separation of the liquids being distilled.

<h3>Uses of fractional distillation :</h3>

Alcohol purification, desalination, crude oil refinement, and the creation of liquefied gases from air are all applications of distillation.

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1 year ago