Sunlight reflects off the smooth surface of a swimming pool. For what angle of reflection is the reflected light completely polarized?90 degrees0 degrees0.023 degrees53.1 degrees36.93 degrees
Answers
The angle of reflection for which the reflected light is completely polarized is known as the Brewster's angle. For a swimming pool, this angle is typically around 53.1 degrees. At this angle, the light becomes completely polarized parallel to the surface of the water.
The angle of reflection for which the reflected light is completely polarized is when the angle of incidence is equal to the Brewster's angle, which is given by:
θp = arctan(n)
where n is the refractive index of the medium in which the light is incident. For water, n = 1.33. Therefore, the Brewster's angle for water is:
θp = arctan(1.33) = 53.1 degrees
Therefore, the angle of reflection for which the reflected light is completely polarized is 53.1 degrees.
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Related Questions
Figure 13 shows a child’s toy . The toy hangs from a hook in the ceiling.
A child pulls the toy downwards and then releases it.
The toy oscillates up and down with the frequency of 1.25.
How many times each second will the toy oscillate up and down?
Answers
The number of oscillations of the toy in a second is 1.25.
What is frequency?This is the number of complete oscillation of an object is a given period.The given parameter:
Frequency of the toy, F = 1.25 HzThe frequency of an object is calculated as follows;
\(f = \frac{n}{t} \\\\\)
where;
n is the number of oscillationst is the time of motionThe number of oscillations of the toy in a second is calculated as follows;
\(1.25 = \frac{n}{1} \\\\n = 1.25\)
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Predict what would happen to the volume of a gas if the pressure on that gas were doubled and then the absolute temperature of that gas were doubled.
Answers
The new volume of the gas will remain the same.
Data obtained from the question Initial pressure (P₁) = PInitial temperature (T₁) = TInitial volume (V₁) = VNew pressure (P₂) = 2PNew temperature (T₂) = 2TNew Volume (V₂) =? How to determine the new volumeThe new volume of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(PV) / T = (2P × V₂) / 2T
Cross multiply
T × 2P × V₂ = PV × 2T
2PT × V₂ = 2PVT
Divide both side by 2PT
V₂ = 2PVT / 2PT
V₂ = V
Thus, the new volume will remain the same
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Why do sex cells contain only half the number of chromosomes needed for offspring? Explain
Answers
Answer:
None, egg cells don't have chromosomes. No, sex cells do have chromosomes. Meiosis reduces chromosome number so that sex cells (eggs and sperm) have a half set of chromosomes–one homolog of each pair. This is the haploid number.
calculate the magnitude of the net force on a 4.5 kg mass if the mass moves straight up at constant speed
Answers
Answer:
0
Explanation:
as Newton 1st Law said that every object will remain at rest or in uniform motion (constant speed) in a straight line unless compelled to change its state by the action of an external force
Net Force = 0
which statement is NOT correct regarding the rotating field in three - phase machines : 1- The flux from any phase is pulsating ( acting on one angle and the magnitude is changing with time ) 2-The resulting flux is rotating at the synchronous speed 3-The magnitude of the resulting flux is equal to the magnitude of the flux of any phase multiplied by √3 4-The resulting flux is rotational ( the magnitude is constant and the angle is changing with time )
Answers
The statement that is NOT correct regarding the rotating field in three-phase machines is: 4- The resulting flux is rotational (the magnitude is constant and the angle is changing with time)
In a three-phase machine, the rotating field is created by the combination of magnetic fluxes generated by each of the three phases. Each phase produces a pulsating flux, meaning that the magnitude and angle of the flux change with time.
Statement 1: The flux from any phase is pulsating (acting on one angle and the magnitude is changing with time). This statement is correct. Each phase produces a pulsating flux that varies in magnitude and angle as the machine operates.
Statement 2: The resulting flux is rotating at the synchronous speed. This statement is correct. The combination of the three pulsating fluxes generates a rotating magnetic field that rotates at the synchronous speed, which is determined by the frequency of the power supply.
Statement 3: The magnitude of the resulting flux is equal to the magnitude of the flux of any phase multiplied by √3. This statement is correct. When the three fluxes combine, the magnitude of the resulting flux is the vector sum of the individual fluxes. Since the fluxes are 120 degrees apart, their magnitudes add up in a vectorial manner, resulting in a magnitude equal to the magnitude of any single phase multiplied by the square root of 3 (√3).
Statement 4: The resulting flux is rotational (the magnitude is constant and the angle is changing with time). This statement is NOT correct. The magnitude of the resulting flux is not constant, as it is the vector sum of the pulsating fluxes from the three phases. The angle of the resulting flux does change with time due to the pulsating nature of the individual phase fluxes.
Therefore, the correct statement among the given options is statement 4, which is NOT correct regarding the rotating field in three-phase machines.
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60-cm
c
m
-diameter wheel accelerates uniformly about its center from 130 rpm
r
p
m
to 320 rpm
r
p
m
in 4. 1 s
s
Answers
A 60-cm diameter wheel accelerates uniformly from 130 rpm to 320 rpm in 4.1 s.
The problem gives us two important pieces of information about the wheel's motion: its initial and final rpm, and the time it took for the acceleration to occur.
To solve for the wheel's acceleration, we can use the following equation:
a = (v_f - v_i) / t
where a is acceleration, v_f is final velocity, v_i is initial velocity, and t is time. In this case, substituting the given values gives:
a = (320 rpm - 130 rpm) / 4.1 s
a = 46.34 rpm/s
Next, we can use the wheel's diameter to convert its rpm into linear velocity, using the formula:
v = πdN / 60
where v is velocity, d is diameter, and N is rpm. Substituting the given values gives:
v_i = π(60 cm)(130 rpm) / 60 = 409.16 cm/s
v_f = π(60 cm)(320 rpm) / 60 = 1022.91 cm/s
Finally, we can use the time and acceleration to find the distance the wheel traveled during its acceleration, using the formula:
d = vi*t + (1/2)at^2
where d is distance, vi is initial velocity, t is time, and a is acceleration. Substituting the given values gives:
d = (409.16 cm/s)(4.1 s) + (1/2)(46.34 rpm/s)(4.1 s)^2
d = 782.34 cm
Therefore, the wheel traveled approximately 7.82 meters during its acceleration.
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Why do reference points change based on who is observing?
Answers
Reference points change based on who is observing because they are subjective and depend on the frame of reference of the observer. A frame of reference is the set of coordinates and axes used to describe the position and motion of objects.
Different observers may have different perspectives, locations, or velocities relative to the observed object, leading to different reference points.
For example, consider two people observing a moving car. If one person is standing still on the sidewalk, their reference point would be the stationary position relative to the car. However, if another person is in a moving car alongside the observed car, their reference point would be the moving car itself.
Therefore, each observer's unique frame of reference affects their perception and measurement of position, velocity, and other physical quantities. Recognizing the relativity of reference points is crucial in understanding how different observers may have different interpretations of the same event or object's motion.
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The diagram below shows a wind turbine.
At a particular wind speed, a volume of 2.3 × 10ª m³
of air passes the blades each second.
The density of air is 1.2 kg/m³.
Calculate the mass of air passing the blades per
second.
Answers
The mass of air passing the blades per second is 2.76 × \(10^{4}\) kg
What is wind energy formula?A kind of solar energy is wind energy. The technique through which wind is utilized to generate power is known as wind energy. The kinetic energy in the wind is converted to mechanical power by wind turbines.
A renewable energy source that harnesses the power of the wind is wind energy. The wind energy formula is given by,
P = 1/2 ρAV³, where P = Power
Given that,
density of air (ρ) = 1.2kg/m³
volume (v) = 2.3×\(10^{4}\) m³
Now calculate mass of the air -
mass = density × volume
= 1.2 × (2.3 × \(10^{4}\))
= 2.76 × \(10^{4}\) kg
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Impulse equals?
A) momentum x velocity
B) momentum x time
C) mass x velocity
Answers
Answer:
B
Explanation:
The impulse experienced by an object is the force•time.
Jerry measures the time it took for a ball dropped from a balcony to hit the ground. His stopwatch reads 2.6 s. How high is the balcony?
Answers
Answer:
33.12m
Explanation:
Given parameters:
Time of fall = 2.6s
Unknown:
Height of the balcony = ?
Solution:
To solve this problem; use this expression:
H = ut + \(\frac{1}{2}\) gt²
u is the initial velocity
t is the time
g is the acceleration due to gravity = 9.8m/s²
So;
H = (0 x 2.6) + ( \(\frac{1}{2}\) x 9.8 x 2.6²) = 33.12m
Question 1 (1 point)
A boy on a treasure hunt walks 12 paces West, then 21 paces North, then 25 paces
East. What is the magnitude of boy's resultant displacement in meters?
Answers
Answer:
The magnitude of the boy's displacement is 24.698 paces which is in the direction of approximately 58.24° North of East
Explanation:
The given parameters are;
The distance West the boy on a treasure hunt walks = 12 paces
The distance North the boy on a treasure hunt then walks = 21 paces
The distance East the boy on a treasure hunt then walks = 25 paces
Writing the displacement in vector format, gives;
d = -12·i + 21·j + 25·i
Which gives
d = 13·i + 21·j
The magnitude of the boy's resultant displacement is given as follows;
\(\left | \mathbf{d} \right | = \sqrt{d_x^2 + d_y^2}\)
Where;
\(d_x = 13, \ d_y = 21\)
\(\left | \mathbf{d} \right | = \sqrt{13^2 + 21^2} = \sqrt{610} \approx 24.698 \ paces\)
The magnitude of the boy's displacement is 24.698 paces
The direction of the displacement is tan⁻¹(21/13) ≈ 58.24° North of East.
A person bungee jumped off a cliff. Two seconds after the jump, the person’s velocity was 40 m/s. Five seconds after the jump, what was the final velocity? (neglect air resistance)
Answers
Gravity causes an object to fall toward the ground more quickly the longer it is in free fall. In reality, an object's velocity increases by 9.8 m/s, and by the time it starts to fall, it has already reached 9.8 m/s.
All matter is impacted by a force called gravity in the universe. Any two non-zero mass objects or particles will gravitationally gravitate toward one another. Gravity has an impact on objects of all sizes, from subatomic particles to galaxy clusters.
Speed after 2 seconds = 40m/s
Since falling causes velocity to increase by 9.8m/s,
Speed 5 seconds after the jump = 40 + (3 * 9.8)
= 69.4 m/s
When an object is moving, its velocity serves as a measure of how quickly its location is changing as it is perceived from a given point of view and as time is measured using a specific unit of measurement.
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The waters off the coast of Iceland are filled with pods of killer whales, which migrate there during the summer. Wildlife parks that rely on the killer whales for entertainment hunt the killer whale almost exclusively in the water of Iceland, because strict sanctions forbid them from doing so off the coast of North America, an area also abundant in killer whales. Since Iceland recently gave in to pressure from international groups opposed to the hunting of killer whales, it too will forbid the hunting of killer whales off its coast. Therefore, all wildlife parks will be forced to end their shows featuring killer whales once their current killer whales are unable to perform. " All of the following cast doubt on the conclusion of the argument EXCEPT?
Answers
The fact that Iceland recently gave in to pressure from international groups opposed to the hunting of killer whales and will forbid the hunting of killer whales off its coast does not cast doubt on the conclusion of the argument.
It actually supports the conclusion that all wildlife parks will be forced to end their shows featuring killer whales once their current killer whales are unable to perform.
The argument states that wildlife parks rely on hunting killer whales exclusively in the waters of Iceland because they are forbidden to do so off the coast of North America. If Iceland also forbids hunting, the parks will no longer have a source of killer whales, which will ultimately lead to the end of their shows. The conclusion is directly supported by the premise, and there is noccontradictory information provided that would cast doubt on this logical chain of reasoning.
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During the Egg Drop lab sim you manipulated several variables like height, egg mass and impact surface. If you dropped a large egg from 10 meters which one condition would allow the best chance for the egg to survive unbroken?
Answers
Answer:
An egg with a thick shell.
Explanation:
Hope this helps.
You have seen dogs shake to shed water from their fur. The motion is complicated, but the fur on a dog's torso rotates back and forth along a roughly circular arc. Water droplets are held to the fur by contact forces, and these forces provide the centripetal acceleration that keeps the droplets moving in a circle, still attached to the fur, if the dog shakes gently. But these contact forces - like static friction - have a maximum possible value. As the dog shakes more vigorously, the contact forces cannot provide sufficient centripetal acceleration and the droplets fly off. A big dog has a torso that is approximately circular, with a radius of 16cm . At the midpoint of a shake, the dog's fur is moving at a remarkable 2.5m/s .
What force is required to keep a 10 mg water droplet moving in this circular arc?
What is the ratio of this force to the weight of a droplet?
Answers
To determine the force required to keep a 10 mg water droplet moving in the circular arc created by a shaking dog's fur, we can use the centripetal force formula:
F = m * (v^2 / r)
Where F is the centripetal force, m is the mass of the droplet, v is the velocity of the fur, and r is the radius of the circular arc.
Converting the mass of the droplet to kilograms:
m = 10 mg = 10 * 10^(-6) kg
Substituting the given values:
F = (10 * 10^(-6)) * ((2.5)^2 / 0.16)
Calculating this expression gives us the centripetal force required to keep the droplet moving in the circular arc.
To find the ratio of this force to the weight of the droplet, we divide the centripetal force by the weight of the droplet. The weight of the droplet can be calculated using the formula:
Weight = mass * gravitational acceleration
Let's assume the gravitational acceleration to be approximately 9.8 m/s^2.
Weight = (10 * 10^(-6)) * 9.8
Finally, we can calculate the ratio of the centripetal force to the weight of the droplet by dividing the centripetal force by the weight.
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A girl rides her bike at 18 m/s for 31 s. How far does she travel in that time
Answers
Answer: 558 meters in 31 seconds.
Explanation:
You simply do 18*31 because every single second for thirty one seconds, the girl is going 18 meters.
Therefore, at this rate, she would ride about 558 meters in 31 seconds.
Answer:
558 m
Explanation:
The formula for distance, given speed and time, is D=ST. When you plug the numbers into this, D=(18)(31), and 18 times 31 *puts in calculator* is 558.
The speed is in meters per second, so meters would be your unit.
So, the answer is 558 m.
Hope I helped!!! :)
Laskar, J.: 1990, The chaotic motion of the solar system. A numerical estimate of the size of the chaotic zones, Icarus, 88, 266-291
Answers
The chaotic nature of the Solar System excluding Pluto was established by the numerical computation of the maximum Lyapunov exponent of its secular system over 200 myr.
What is chaotic motion of the solar system ?There has been an increase in awareness of chaotic dynamics in the solar system over the past 20 years. The orbits of tiny objects in the solar system, such as asteroids, comets, and interplanetary dust, are now known to be chaotic and to experience significant variations across geological time periods.
a completely unpredictable orbit, or one where significant changes in the orbit can result from even small changes in the position and/or velocity of the orbiting entity.Learn more about Chaotic motion here:
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how long does a low mass star stay on the main sequence
Answers
In summary, the amount of time a low mass star will stay on the main sequence is determined by its mass, radius, and temperature. Typically, a low mass star will remain on the main sequence for billions of years.
A low mass star is a star that is small in size, mass, and brightness. It is typically around 0.5-2 solar masses and is relatively cool compared to other types of stars. On the main sequence, which is the period when the star is fusing hydrogen into helium in its core, a low mass star can remain for a very long time. The length of time that a low mass star remains on the main sequence is determined by the rate at which it fuses hydrogen into helium in its core. This rate is determined by the star's mass, radius, and temperature. Generally, the lower the mass of the star, the longer it will remain on the main sequence. For example, a star with a mass of 0.5 solar masses will remain on the main sequence for around 20-30 billion years, while a star with a mass of 1 solar mass will remain on the main sequence for around 10 billion years.
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A swimmer pushes water back with her arms, but her body moves forward.
What law is this?
Answers
Answer: the answer is 3rd
Answer:
Its Newton third law of motion.
Explanation:
For every action,there is equal and opposite reaction.
Stored digital data are easily changed. How could this be a disadvantage?
A. Changing data results in too much data to be stored in most
computers
B. Easily changed data are difficult to protect with a security system.
c. Once a change is made, the change is permanent.
D. True information in the digital data can be changed to false
information
SUBMIT
I need help on this
Answers
The disadvantage of easily changeable digital data is: true information in the digital data can be changed to false information. Hence, option (D) is correct.
What is digital data?Digital data, in information theory and information systems, is information represented as a string of discrete symbols, each of which can take on one of only a finite number of values from some alphabet, such as letters or digits.
An example is a text document, which consists of a string of alphanumeric characters. The most common form of digital data in modern information systems is binary data.
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Answer: The answer is D.
Explanation: I took the test
Suppose you throw a baseball straight downward so that initially it has 15 J of gravitational potential energy and 200 J of kinetic energy. How much energy does the ball lose by the time it hits the ground
A. 215 J
B. 200 J
C. 15 J
D. 0 J
PLZ TELL ME THE ANSWER AS QUICK AS POSSIBLE :(
Answers
i need help with this too:( if u found out the answer lmk
The Kinetic energy of an apple is 6.00 joules. The apple is moving at a velocity of 3.00 m/s. What is the mass of the apple?)
Answers
Answer:
4/3 kg
Explanation:
KE = (1/2)mv^2
6=0.5*m*(3)^2
m=4/3
Convert 350.0mL at 740 K to its new volume at standard temperature
Answers
Answer:
129.12 ml
Explanation:
If answer is correct feel free to replay me for explanation.
To decide whether an object is electrically charged, we need to observe its repulsion from some other object, not its attraction. Why is attraction insufficient
Answers
To decide whether an object is electrically charged, we need to observe its repulsion from some other object, not its attraction.
The reason attraction is insufficient for this purpose is because both charged and uncharged objects can attract each other. As such, attraction cannot be used to distinguish between charged and uncharged objects We need to observe an object's repulsion from another object to determine if it is electrically charged.
This is because attraction is not a sufficient indicator of an object's electrical charge. Charged and uncharged objects can attract each other, making attraction an unreliable method of determining electrical charge.
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Why does the moon appear to take on a colored hue during an eclipse?.
Answers
Explanation: Because the moons light supply is cut off. The earth is covering up part of the sun from getting on the moon so it cuts off the moons light supply.
A student walks from her car to a tree, 21 meters away at 1.0 m/s, and returns at 4.0 m/s. What is her average speed for the entire trip in m/s?
Answers
The average speed of the student for the entire trip to and from her car is 1.6 m/s.
What is the average speed of the student for the entire trip to and from her car?The average speed travelled by the student is given by the formula below:
Average speed = total distance/total time takenFrom the dat provided:
The total distance travelled by the student = 21 m + 21 m
total distance travelled by the student = 42 m
Total time = time taken going + time taken returning
Time taken = distance /speed
Time taken going = 21/1.0 = 21 s
Time taken returning = 21/4 = 5.25 s
Total time = 21 + 5.25 = 26.25 seconds
Average speed = 42/26.35
Average speed = 1.6 m/s
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how do light-colored igneous rocks differ from dark-colored rocks?
Answers
Light-colored igneous rocks and dark-colored igneous rocks differ in their chemical composition and mineral content. Light-colored igneous rocks are composed of minerals that are rich in silica, such as quartz and feldspar. Dark-colored igneous rocks are composed of minerals that are rich in iron and magnesium, such as olivine and pyroxene.
The chemical composition of an igneous rock determines its color. Light-colored igneous rocks are typically light gray, pink, or white. Dark-colored igneous rocks are typically black, brown, or green.
The mineral content of an igneous rock also affects its properties. Light-colored igneous rocks are typically less dense and have a lower melting point than dark-colored igneous rocks.
Light-colored igneous rocks are typically found in areas where the crust is thin, such as continental rifts and the edges of continents. Dark-colored igneous rocks are typically found in areas where the crust is thick, such as oceanic ridges and the interiors of continents.
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a moving car has 40,000 j of kinetic energy while moving at a speed of 7.0 m/s. a spring-loaded automobile bumper compresses 0.30 m when the car hits a wall and stops. What can you lean about the bumpers spring using the information?
Answers
The bumper's spring constant is 8.9 × 10^5 N/m.
Given that energy wasn't lost from the point when the car had 40,000 J of KE to when it impacted the wall, i.e. the energy was perfectly conserved (assumption)
The kinetic energy of the car would be converted to the Elastic potential energy of the bumper spring. According to the law of conservation of energy.
K.E = Elastic P.E = (1/2)kx^2. .....1
Where;
k = bumper spring constant.
x = compression length of spring.
From equation 1
k = 2K.E/x^2
K.E = 40,000J
x = 0.30m
k = 2(40000)/(0.30^2)
k = 80000/0.09
k = 888,888.89N/m
k = 8.9 × 10^5 N/m
So the bumper's spring constant is 8.9 × 10^5 N/m.
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10. A child drops a ball from a window. The ball strikes the ground in 3.0 seconds. What is the velocity of the ball the instant before it hits the ground?
Answers
PLEASE HELP!!!!
What is the measure of The gravitational force on an object?
Answers
weight and mass.
Explanation:
Weight and Mass Mass is a measure of the amount of matter in an object; weight is a measure of the gravitational force exerted on an object. The force of gravity on a person or object at the surface of a planet is known as weight.
Answer:
It's the objects weight
Explanation:
A lighter object will fall slower than a heavier object