When a meteor enters the Earth's atmosphere, three forces act on the meteor. Gravity and upthrust are two of these forces. Give the name of the other force. [1 mark]

Answer:

10.17 m/s in the direction the compact car was going (+)

Explanation:

Law of conservation of momentum states that total P before the collision must equal total momentum after the collision.

P = mv

solve for v, velocity of the two cars stuck together after the collision:

(187kg)(-38 m/s) + (702kg)(23 m/s) = (187 + 702 kg)v

         momentum before               =   momentum after

-7106 kg·m/s + 16146 kg·m/s = 889 kg(v)

9040 kg·m/s = 889 kg(v)

v = 9040 kg·m/s / 889 kg = 10.17 m/s

Your friend is correct. In order to determine the speed at which the person who leaves point B must walk, you need to know the length of AC and BC.

This is because the time it takes for each person to reach point C is dependent on the distance they must travel and the speed at which they are traveling.

Using the formula time = distance / speed, you can calculate the time it takes for each person to reach point C.

For the person leaving point A, the time it takes to reach point C is tA = AC / 3, since they are traveling at a speed of 3 miles per hour.

For the person leaving point B, the time it takes to reach point C is tB = BC / x, where x is the speed at which they are traveling.

Since both people are intended to reach point C at the same time, you can set the two equations equal to each other:

AC / 3 = BC / x

Cross-multiplying and solving for x gives you the speed at which the person leaving point B must walk:

x = 3BC / AC

Without knowing the length of AC and BC, you cannot determine the speed at which the person leaving point B must walk. Therefore, your friend is correct.

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The distance covered by the body after 15 seconds down the inclined plane is approximately 1102.5 meters.

We can use the equations of motion to solve this problem. The acceleration of the body down the inclined plane can be found using trigonometry:

a = gsin(30°) = (9.8 m/s²)(1/2) = 4.9 m/s²

where g is the acceleration due to gravity.

Using the equation of motion:

s = ut + (1/2)at²

where s is the distance covered, u is the initial velocity (which is zero in this case), and t is the time taken, we can find the distance covered after 15 seconds:

s = (1/2)4.9(15)² = 1102.5 meters

Therefore, the distance covered by the body after 15 seconds down the inclined plane is approximately 1102.5 meters.

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Answer:

B

Explanation:

The moon effects the Earth's tides more than the sun.

The correct statement for the formation of tides on Earth is "The Moon has the greatest effect on tides since it is closer to Earth than the Sun."

Tides are caused by the gravitational pull of the Moon and Sun on Earth's oceans.

While the Sun has a greater mass than the Moon, the Moon is much closer to Earth and therefore has a greater effect on the tides.

The Moon's gravitational pull causes the oceans to bulge towards it, creating high tides on the side of Earth closest to the Moon and on the opposite side of Earth.

As Earth rotates, different areas experience high and low tides. The Sun also has an effect on the tides, but it is less significant than the Moon's effect.

In conclusion, the statement "The Moon has the greatest effect on tides since it is closer to Earth than the Sun" is true for the formation of tides on Earth.

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A modern large wind turbine can generate about 250 kw of electricity, whereas a large nuclear power plant can generate 1,000 mw so, 4000 wind turbines would be required to give the same output as one nuclear power plant.

To know how many wind turbines would be required to give the same output as one nuclear power plant is a simple mathematical calculation that involves only the conversion of kilowatts to megawatts.

Wind turbine and Nuclear power plant electricity generation in modern large wind turbine with moderate winds is 250 KW whereas, the generation capacity of large nuclear power plant is 1,000 MW.

To determine how many wind turbines would be required to give the same output as one nuclear power plant, we need to convert kilowatts to megawatts.

Since 1 MW = 1,000 kW, therefore 1,000 MW = 1,000,000 kW

We are given that a modern large wind turbine can generate about 250 kW of electricity

Therefore, the number of wind turbines required to give the same output as one nuclear power plant can be calculated as:

Number of wind turbines = Total capacity of nuclear power plant / Capacity of single wind turbine

                                         = 1,000,000 / 250= 4000

Thus, 4,000 wind turbines would be required to give the same output as one nuclear power plant.

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The X component of the tiger's velocity is 53.59 km/h.

The vertical (Y) component of the tiger's velocity is 12.37 km/h.

The components of the tiger's velocity include X and Y components; the magnitudes of the X and Y components is calculated using the following formula.

The X component of the tiger's velocity is calculated as;

Vx = V cosθ

where;

Vx = 55 km/h  x  cos (13)

Vx = 53.59 km/h

The vertical (Y) component of the tiger's velocity is calculated as;

Vy = V sinθ

Vy = 55 km/h  x sin (13)

Vy = 12.37 km/h

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The driver should be at least 39 meters behind the vehicle in front at 30mph. Rounded to 2 significant figures, this is 39 meters.

Meters are a unit of length used in the International System of Units (SI) to measure distance or displacement. A meter is defined as the length of the path traveled by light in a vacuum during a time interval of 1/299,792,458 of a second. This definition provides a precise and universal standard for the measurement of length, as the speed of light is constant and independent of the observer.

Meters are commonly used to measure the length or width of objects, as well as the distance between two points. They are also used in scientific fields such as physics, where they are used to measure quantities such as wavelength and amplitude.

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A hair dryer uses the electricity from the power source to run its motor and heating element when it is hooked into an electrical outlet. Heat and kinetic energy are created from this electrical energy.

One of the most frequent causes of circuit breakers being tripped by a hairdryer is an overloaded circuit. A circuit overload occurs when there are several high-powered gadgets drawing 15 to 20 amps of electricity simultaneously on the same circuit.

A conventional in-room, wall-mounted hair dryer uses roughly 1.6 kW of power on average. This indicates that a guest will use 0.4 kilowatt-hours (kWh) of power if they use their hair dryer for 15 minutes.

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The increase in internal energy of the tie and spike is approximately 1.12 Joules.

The initial kinetic energy of the spike is:

K_i = (1/2) * m * v^2

K_i = (1/2) * 0.60 kg * (1.8 m/s)^2

K_i = 1.94 J

The amount of kinetic energy that is absorbed as internal energy is:

K_absorbed = 0.578 * K_i

K_absorbed = 0.578 * 1.94 J

K_absorbed = 1.12 J

Thus,the value is 1.12 Joules.

Kinetic energy is the energy an object has because of its motion. If we want to accelerate an object, then we must apply a force. Applying a force requires us to do work. After work has been done, energy has been transferred to the object, and the object will be moving with a new constant speed.

Kinetic energy is the energy of motion, observable as the movement of an object or subatomic particle. Every moving object and particle have kinetic energy. A person walking, a soaring baseball, a crumb falling from a table and a charged particle in an electric field are all examples of kinetic energy at work.

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(a) The tension in the hitch is 339.75 N.

equal to the mass of the trailer times the acceleration (453 kg x 0.75 m/s2 = 339.75 N).
(b) The force of static friction exerted by the road on the pickup truck is  1038.75 N.
(c) The force the trailer exerts on the pickup truck is equal to 339.75 N.

(a) The tension in the hitch is equal to the mass of the trailer times the acceleration.

It is calculated by,

453 kg x 0.75 m/s2

= 339.75 N.

(b) The force of static friction exerted by the road on the pickup truck to propel it forward is equal to the mass of the pickup truck times the acceleration

It is calculated by

1385 kg x 0.75 m/s2

= 1038.75 N

(c) The force the trailer exerts on the pickup truck is equal to the mass of the trailer times the acceleration.

It is calculated by,

453 kg x 0.75 m/s2

= 339.75 N

Static friction is a force that keeps an object at rest. Static friction definition can be written as: The friction experienced when individuals try to move a stationary object on a surface, without actually triggering any relative motion between the body and the surface on which it is on.

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Digital data can be encoded by a computer program and are easy to change by a computer program. Therefore, options A and D are correct.

A and D are two reasons why digital storage of data is more secure than analogue storage.

A - Digital data can be encoded using various encryption techniques that make it more difficult for unauthorized individuals to access or interpret the data.

D - Digital data are easy to change or modify using a computer program, but this can also be a security advantage as it allows for quick updates and corrections to be made, and changes can be tracked and logged for security purposes.

B and C are not necessarily unique to digital storage, and may also be applicable to analogue storage. Fingerprint or facial ID can be used to protect physical storage devices, and a strong password can also be used to secure both digital and analogue storage.

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Answer:

A. Digital data can be encoded by a computer program.

B. Digital data can be protected by a fingerprint or facial ID.

Explanation:

did quiz

Volcanic activity and the movement of lithospheric plates both result in the formation of new mountains.

Volcanic activity can include the release of gases, pro lava emissions, or extremely ferocious explosive bursts that can last for several hours. Volcano shapes and sizes are influenced by eruption type, which also affects the relative volumes & types of lava flows and volcaniclastic debris.

Worldwide repercussions would result from another big caldera-forming eruption at Yellowstone. The repercussions of such a large eruption would be felt locally and include ash fall and short-term (decades to years) changes to the global climate.

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This implies that when the force applied on an item increases, so does the object's acceleration. Similar to how an object's acceleration decreases as its mass increases, so does its mass.

Force with acceleration are directly correlated, as shown by Newton's second law. The more force that is exerted to an object, the faster it will accelerate. For instance, the acceleration doubles when the force exerted on an object doubles.

The relationship among acceleration and force is explained in Newton's second laws of motion. They are comparable in size. An object moves forward at a speed equal to the force pushing against it. The simplest approach to determine force is to multiply mass by acceleration.

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If you were in a rocket ship traveling away from earth at a speed close to the speed of light, then the changes that you would notice in the clock and the volume of your friend who stayed on earth are time dilation and volume dilation.

Time dilation: According to special relativity theory, time dilation occurs as an object's velocity approaches the speed of light. The faster an object travels, the slower its internal clock ticks. Time would seem to pass more slowly for you than it would for your friend on earth. The time on the rocket would appear to be slower than the time on the earth, and the rocket's clock would tick more slowly as seen from the earth.

Volume dilation: Volume dilation is a term used to describe a length contraction or expansion of an object along the direction of motion. According to the Lorentz transformation, as the velocity of an object approaches the speed of light, its length appears to shrink in the direction of motion.

This would result in the volume of the object appearing to decrease in size as well. Your friend on earth would notice that your rocket ship appears to be shorter than it really is, and its volume would appear to be less.

Therefore, time dilation and volume dilation are the two factors that would be noticed.

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The height of a water-filled manometer required to measure blood pressure as high as 300 mm Hg is 229.69 cm.

A manometer is a pressure measurement device that is utilized to measure the pressure of gases and liquids in a container.

The weight of the liquid in the manometer rises or falls depending on the pressure of the gases and liquids in the container.

In order to measure blood pressure, a water-filled manometer is used. The density of blood is 1.05 x 103 kg/m3. The height of the manometer is required to be found.

The pressure of blood is 300 mm Hg.

The following formula will be used to calculate the height of the manometer:

h = (P*d)/(g*H2O)

where, P = 300 mm Hg,

d = 1.05 × 103 kg/m^3,

g = 9.8 m/s2, and

H2O = 1000 kg/m^3

Substituting the values in the equation:

h = (300*1.05*103)/(9.8*1000)

h = 229.69 cm

The height of the manometer must be 229.69 cm to measure blood pressure as high as 300 mm Hg.

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Answer:

Let the mass of the ball be m, and let v be the velocity of the ball before it is caught. Let the final velocity of the person and ball be 0 after the catch. We can write the following equation:

(m)(v) + (78 kg)(3 m/s) = (m + 78 kg)(0 m/s)

Simplifying this equation, we get:

(m)(v) = -234 kg m/s

We also know that the initial velocity of the ball is 34 m/s, so we can write another equation using this information:

(m)(34 m/s) = (m)(v)

Substituting the first equation into the second equation, we get:

(m)(34 m/s) = -234 kg m/s

Solving for m, we get:

m = -234 kg m/s / (34 m/s) = -6.88235 kg

This is a negative mass, which doesn't make sense. We made an error in our calculations, possibly due to significant figures. Let's try again with more precision:

(m)(34.0 m/s) = -234 kg m/s

m = -234 kg m/s / 34.0 m/s = 6.88235 kg

Rounding to the appropriate number of significant figures, we get:

m ≈ 6.9 kg

Therefore, the ball would need to have a mass of approximately 6.9 kg in order to stop a 78 kg person moving at 3 m/s when they catch it.

Explanation:

Answer:

The specific heat capacity of water is 4.184 J/g°C, and we need to find the amount of heat required to raise the temperature of 10 kg (or 10,000 g) of water from 20°C to 100°C.

The formula for calculating the amount of heat required is:

Q = m * c * ΔT

where:

Q = heat energy (in Joules)

m = mass (in grams)

c = specific heat capacity (in J/g°C)

ΔT = change in temperature (in °C)

We can start by calculating the change in temperature:

ΔT = 100°C - 20°C = 80°C

Then, we can plug in the values and solve for Q:

Q = 10,000 g * 4.184 J/g°C * 80°C

Q = 3,347,200 J

Therefore, Peter needs 3,347,200 Joules of heat to raise the temperature of his 10 kg vat of water from 20°C to 100°C.

Answer:

(C) it is moving to the right wrt to the ground

The crate is accelerated to the right (wrt the ground) because the frictional force between the truck bed and the crate is to the right and it is this force that provides movement to the crate

Answer : a) The crate will be moving in the negative x direction (to the left) when it falls off the truck. The force of the acceleration of the truck in the positive x direction will push the crate in the negative x direction. This will cause the crate to move away from the truck in the negative x direction. Correct answer is option B

This is because the truck is accelerating in the positive x direction (to the right), and the crate, being free to move, will have the same acceleration as the truck. This will cause the crate to slide backwards off the truck in the negative x direction.

Therefore, the crate will be moving in the negative x direction (to the left) when it falls off the truck.

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The amplitude of wave is 2.0 cm and the frequency is 4.0 Hz, then the correct statements are : B) The distance between P and R is 6.0 cm ; D)Particles at P and R are in the phase.

Moving wave whose oscillations are perpendicular to the direction of the wave is known as transverse wave.

As we know, v = fλ

v is the velocity of wave, f is frequency, and λ is wavelength.

λ = v/f

λ = 24 cm s−1 / 4.0 Hz = 6.0 cm

So the wavelength of the wave is 6.0 cm.

A.)The phase difference between particles at P and S is π/2 radians.

This statement cannot be determined from given information.

B.)Distance between P and R is 6.0 cm.

This statement is correct as the distance between two consecutive points on a wave with wavelength of 6.0 cm is also 6.0 cm.

C.)The particle velocity at Q is maximum.

This statement cannot be determined from given information.

D.)Particle at P and R are in phase.

This statement is correct as particles at two points on a wave with wavelength of 6.0 cm are in phase.

Therefore, correct statements are B and D.

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A pail of water is swung in a vertical circle using a uniform circular motion. In order to make sure that the water doesn't spill out when the pail is upside down, a minimum constant tangential speed of 2.1 m/s is required.

The minimum constant tangential speed required by the pail of water in order to ensure that the water doesn't spill out when the pail is upside down can be calculated using the formula:

[tex]v = \sqrt{gr}[/tex]

where v = minimum constant tangential speed g = acceleration due to gravity r = radius of the circle.

The distance from the bottom of the pail to Sarah's shoulder is 0.449 m long.

Since this distance is the radius of the circular path, we can substitute it in the formula.

Therefore,

[tex]v = \sqrt{9.8 m/s^2 \times 0.449 \ m} = \sqrt{4.4102 m^2/s^2} = 2.1 \ m/s[/tex]

Therefore, the minimum constant tangential speed required by the pail of water is approximately 2.1 m/s.

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The correct answer in that the Radio waves have a longer wavelength than microwaves.

Radio waves have a wavelength range of about 1 millimeter to 100 kilometers, while microwaves have a wavelength range of about 1 millimeter to 1 meter. This means that radio waves have a longer wavelength than microwaves in general. Wavelength is related to the frequency of the electromagnetic wave by the equation: λ = c / f, where λ is the wavelength, c is the speed of light, and f is the frequency. Since the speed of light is constant, a longer wavelength corresponds to a lower frequency and vice versa. Radio waves are commonly used for communication and broadcasting, while microwaves are used for a variety of applications including cooking food, radar, and wireless communication. Understanding the properties of different electromagnetic waves, including their wavelength and frequency, is important for many areas of science and technology.

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Answer:

Place the thumb of your right  hand in the direction  of the current and the fingers will be pointing "upwards" - this is handy for long straight wires

Therefore, the coefficient of kinetic friction is approximately 0.136

the acceleration of the first crate with friction down the ramp.

We'll use the following formula:

a = gsin(theta) - mucos(theta)*g

whereg = acceleration due to gravity = 9.8 m/[tex]s^2[/tex]

theta = angle of the ramp = 25 degrees

mu = coefficient of kinetic friction

Plugging in the values, we get:

a = 9.8sin(25) - mucos(25)9.8

a = 3.9763 - 3.5299mu

Plugging in the values, we get:

[tex]v^2=[/tex] 0 + 2*(3.9763 - 3.5299*mu)6

[tex]v^2[/tex] = 47.715 - 42.1794mu

the velocity of the second crate without friction at the bottom of the ramp. We know it's 2.5 times the velocity of the first crate with friction, so:v' = 2.5sqrt(47.715 - 42.1794mu)

no friction for the second crate, we can use the conservation of energy to relate the initial potential energy to the final kinetic energy:

mg6sin(25) = 0.5m*[tex]v^2[/tex]

where

g = acceleration due to gravity = 9.8 m/

Simplifying and plugging in the value for v', we get:

mg6sin(25) = 0.5m*)(47.715 - 42.1794mu)

3.5299 = 11.885 - 10.545*mu

mu = 0.136

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Answer & Explanation FROM YOUR TEACHER:

The blocks does not have the same amount of thermal energy

The mass and temperature of an item are both inversely correlated with thermal energy. Thermal energy is expressed as follows:

Mass times Specific Heat Capacity times Temperature equals thermal energy.

where the material's specific heat capacity relates the amount of heat required to raise a unit mass of the material's temperature by one degree Celsius.

Even if the two blocks are at the same temperature, they will have different quantities of thermal energy since they have different masses. Assuming they are both composed of the same material and have the same specific heat capacity, the block with a mass of 300g will contain more thermal energy than the block with a mass of 33g.

33g × specific heat capacity x 175°C Equals 33g thermal energy of a 33g block.

Heat capacity of a 300g block is equal to 300g times 175°C in terms of thermal energy.

The thermal energy of the two blocks will vary since the masses are different.

a) The kinetic energy of the dart after it is thrown is 2.376 J.

b) The speed of the dart is 18.45 m/s.

c) If the dart were thrown straight upwards, the maximum height it would reach is 17.0 m.

a) The work done on the dart by the applied force is given by:

work = force x distance = 4.40 N x 0.54 m = 2.376 J

Since no energy is lost due to friction, all of this work is converted to the kinetic energy of the dart:

kinetic energy = work = 2.376 J

b) The kinetic energy of the dart can also be expressed as:

kinetic energy = (1/2) x mass x velocity^2

Rearranging this equation gives:

velocity^2 = (2 x kinetic energy) / mass

Substituting the values from part a) gives:

velocity^2 = (2 x 2.376 J) / 0.028 kg = 340.29 m^2/s^2

Taking the square root of both sides gives:

velocity = 18.45 m/s

c) When the dart is thrown straight upwards, its initial vertical velocity is zero. The maximum height it will reach can be calculated using the formula:

maximum height = (initial velocity^2) / (2 x acceleration)

where acceleration is the acceleration due to gravity, which is approximately 9.81 m/s^2.

Substituting the speed calculated in part b) gives:

maximum height = (18.45 m/s)^2 / (2 x 9.81 m/s^2) = 17.0 m

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the block when it is being hauled up the slope at a constant speed using force F perpendicular to a ramp, with a force of 10.0N.

Force is indeed a physical phenomenon that alters or has the potential to alter an object's shape, its state of motion, or both.

According to Newton's second law of motion, the force corresponds to the momentum change divided by the time change. Force equals mass times acceleration, or F = m x a, for a constant mass.

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The volume of water in the bowl is then:

v = (2/3)π(38)^3 - (1/3)π(h - 4)^2(3h + 8) - 256π/3 Case 1: The ball is not completely submerged

The volume of water displaced by the ball is equal to the volume of the ball. The radius of the ball is 4 cm, so its volume is (4/3)π(4)^3 = 256π/3 cm^3. The height of the water in the bowl is h - 4 cm, where h is the total height of the water and the ball. The volume of water in the bowl is given by the formula for the volume of a hemisphere with radius 38 cm minus the volume of the spherical segment cut off by the water level: v = (2/3)π(38)^3 - (1/3)π(h - 4)^2(3h + 8). The volume of water in the bowl is then:

v = (2/3)π(38)^3 - (1/3)π(h - 4)^2(3h + 8) - 256π/3

Case 2: The ball is completely submerged

In this case, the volume of water displaced by the ball is equal to the volume of the ball. The height of the water in the bowl is h, so the radius of the water level is (38^2 - 4^2)^(1/2) = 37.83 cm (by the Pythagorean theorem). The volume of water in the bowl is then the volume of a spherical cap with radius 37.83 cm and height h, minus the volume of the ball:

v = (1/3)πh^2(3(37.83) - h) - (4/3)π(4)^3

Note that the volume of the ball is the same in both cases, but the volume of water in the bowl is different.

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Answer:

0.1 KM/S

Explanation:

First, looking at the question we can say a few things: distance = speed/time. First we will change the 72 KM/HR to ? KM/S (seconds). To change the units fo the speed to seconds, we need to find how many seconds are in an hour which is 3600) then we have 72 KM/3600S and we will divide 3600 by 5 to get 720 which is what we will divide 3600 by to get to 5 seconds and what we will divide 72 by to get your speed in kilometers for your answer. 3600/720 = 5 seconds, and 72/720 is equal to 0.1. To format your answer, you would get 0.1 KM/S (kilometers/seconds)

If your teacher won't accept that answer or you want to change the unit of measurement for speed, you can also find out how many feet/miles a kilometer is and then multiply 0.1 times that value and then you'd have ? ft/s or mi/s.

The polarizing axis of the second pane of the window make with the polarizing axis of the first pane of the window in order to reduce the intensity of the sunlight to 34% of the original value is [tex]23^o[/tex].

The intensity of the sunlight falling from the first pane

[tex]I_1 = \frac{I_o}{2}[/tex]

Once this intensity light passes through the second pane then

[tex]I_2 = I_1 \cos^2 \thetaI_2 = \frac{I_o}{2} \cos^2 \theta[/tex]

Given I2 /Io = 0.42  (42%) so

[tex]0.42 = \frac{1}{2} \cos^2 \theta\\[/tex]

[tex]\cos^2 \theta = 0.84[/tex]

[tex]\cos \theta = \sqrt{0.84} = 0.9165\\[/tex]

[tex]\theta = \cos^{-1} ( 0.9165) = 23.6^o[/tex]

The polarizing axis, also known as the polarization direction, is the direction of the electric field oscillation of an electromagnetic wave. When light passes through a polarizing filter, only the component of the electric field parallel to the polarizing axis is allowed to pass through, while the perpendicular component is blocked.

For example, a linear polarizing filter has a polarizing axis that allows only light waves oscillating in a specific direction to pass through. If the electric field oscillation of the light is perpendicular to the polarizing axis, it will be blocked, resulting in a darker image. In contrast, circular polarizers have a rotating polarizing axis that can selectively block light waves based on their direction of rotation. This is useful in photography and other applications where glare or reflections need to be minimized.

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The electric field strength between the two parallel charged plates is 514.29 V/m.

The electric field strength (E) between two parallel charged plates can be determined using the formula:

E = V / d

where V is the potential difference (in volts) between the plates, and d is the distance (in meters) separating them.

In this case, the potential difference V is 18.0 V and the distance d is 3.50 cm. First, we need to convert the distance from centimeters to meters:

d = 3.50 cm x (1 m / 100 cm) = 0.035 m

Now we can calculate the electric field strength:

E = 18.0 V / 0.035 m = 514.29 V/m

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