What is one reason that electromagnetic waves are used in long-distance communication?
A. They travel rapidly.
B. They move matter easily
C. They do not lose energy over long distances.
D. Informatioŋ can be encoded in the wave speed.
One reason that electromagnetic waves are used in long-distance communication is, that they do not lose energy over long distances. So Option C is correct
What are electromagnetic waves ?Electromagnetic waves are a type of wave that consists of oscillating electric and magnetic fields. They are propagated through space or through a material medium, and they have the ability to travel through a vacuum, which is the absence of matter. Electromagnetic waves have a wide range of frequencies, which determines the type of electromagnetic wave. The most familiar types of electromagnetic waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
One of the property of the electromagnetic waves is that they do not lose energy over long distances.
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A particle with an electric charge of 2*10-3^C is a distance of 5 m from a particle with a charge of 8*10-5 C . What is the strength of the electrostatic force between the two particles?
Answer:
F= K q1q2/r^2
K is a constant uqual to= 9 x 10^9 N m^2 C^-2
F= 9 x 10^9 x 2 x 10^-3 x 8 x 10^-5/25
F= 1440/25= 58N
Which happens when sound waves enter a vacuum?
A. They are reflected.
B. They move slower
C. They move faster
D. They stop moving
Which of these colors are the main colors of visible light? (Select all that apply.) green violet pink red indigo gold peach
Answer: The main colours of the visible light include:
--> red
--> Green
--> indigo
--> violet
Explanation:
Electromagnetic waves are waves that do not require or need a material medium for its propagation, but they travel successfully in free space (vacuum). These waves exist with an enormous range of frequencies called the electromagnetic spectrum.
Electromagnetic spectrum is defined as the range of all radiation possessing the special characteristics of electromagnetic waves arranged in order of their wavelength or frequency. The electromagnetic spectrum is made up of radio waves, infrared radiation, VISIBLE LIGHT, ultraviolet rays x- rays, gamma rays.
VISIBLE LIGHT: This is a small spectrum from the enormous range of frequencies of electromagnetic radiation. It provides radiant energy and makes things possible to be seen. The wave ranges from 4.5× 10^-7m to 7.0× 10^-7m. When the visible light is passed through a prism, it disperses into different wavelengths according to the colour make up. Dispersion of visible light produces the colors red (R), orange (O), yellow (Y), green (G), blue (B), (I) indigo and violet (V).
Therefore from the options given, red, Green, indigo and violet are examples of visible light spectrum.
Sort by LUSTER. Is there a relationship between color and luster? How are they similar or different?
Color is..blue, red, black... basically COLORS. Whereas luster is like a soft glow or gentle sheen kinda like something is shining. You could say the luster of the blue paint is beautiful.
Explanation:
Bowchiclawowowow
How much force is needed to accelerate a toy car of mass 8 kg at 2m/s
Answer:
4N
Explanation:
f = ma
8kg x 2m/s = 4N
36. What are the necessary condition for work to done
A). Force must be applied on a body
B). The applied force causes the body to displace
C). The force and the displacement must be parallel or in the same direction
D). All of the above
-
YO
Answer:
A
Explanation:
Anything can be doing work at any time. Even when your sleeping work is being done so no part of the body needs to displace before work can be done.
A second hand on a clock has a radius of 10 cm what is the circumference of a circle around which the secondhand travels
An automobile is traveling away from Jill and towards Jack. The horn is honking, producing a sound wave.
a. Towards which person do the sound waves travel the fastest?
b. Who will hear the highest frequency? Why?
Answer:
a. The sound will travel at the speed to both Jill and Jack
b. Jack
Explanation:
a. Doppler effect describes how the frequency of a sound wave changes with regards to an observer that has relative motion to the sound source;
The Doppler effect is given by the following formula;
For a sound that is moving away, as observed by Jill, we have;
[tex]f' = \dfrac{(v - v_0)}{(v + v_s)} \cdot f = \dfrac{v }{(v + v_s)} \cdot f[/tex]
For approaching sound, as observed by Jack, we have;
[tex]f' = \dfrac{(v + v_0)}{(v - v_s)} \cdot f = \dfrac{v }{(v - v_s)} \cdot f[/tex]
Where;
f = The sound wave's actual frequency
f' = The frequency of the moving sound to the observer
v = The speed of the sound wave
v₀ = The observer's velocity = 0
[tex]v_s[/tex] = The velocity of the source (the automobile honking) of the sound wave
From the above equation, we have that the speed of sound, 'v', is the same to both the source, and the observer although the frequency, and therefore, the wavelength of the sound alternatively increases or decreases
b. From the Doppler effect equation, the person who will hear the highest frequency is given by the formula for the frequency when the sound is approaching the observer, which has the lower denominator
Therefore, given that the automobile is travelling towards Jack, jack will hear the higher frequency
Alright boys and girls I'll try and keep things like totally simple for all of u.
How does doubling the height of the cylinder affect its gravitational potential energy? (GPE = mgh)
The gravitational potential energy doubles.
The gravitational potential energy is reduced by half.
The gravitational potential energy quadruples.
The gravitational potential energy is not affected by height.
Help me and I'll give u a lollipop cherry red <3
Answer:
If you're using Edge 2021 it is A
(Give the other person Brainliest)
Explanation:
이것이 도움이 되었기를 바랍니다.
q(≧▽≦q)
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4. A force of 185.6 N is being applied to a square of side length 3 m. Work out the
pressure on the square to 3 significant figures.
Answer:
[tex]p = f \div a[/tex]
[tex]p = \frac{185.6}{ {3}^{2} } = \frac{185.6}{9} = 20.6pa[/tex]
Why are p waves unable to reach the shadow zone
Explanation:
The Shadow zone is the area of the earth
from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves
Which applications, either for diagnostic purposes or for therapeutic purposes, involve the use of X-rays? Check all that apply.
Answer:
1, 3, 7, 8
Source:
Trust me bro
If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that
Protons have moved to the rod
Friction destroyed the electrons in the rod
The silk has become negatively charged
Glass attracts more protons
Answer:
The silk has become negatively charged
A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage
A. Doubles
B. Is the same
C. Halves
D. Quadruples
Answer:
A. Doubles.
Explanation:
In an electromagnetic device such as a generator, when a wire (conductor) moves through the magnetic field between the South and North poles of a magnet, an electromotive force (e.m.f) is usually induced across a wire
The mode of operation of a generator is that a metal core with copper tightly wound to it (conductor coil) rotates rapidly between the two (2) poles of a horseshoe magnet type. Thus when the conductor coil rotates rapidly, it cuts the magnetic field existing between the poles of the horseshoe magnet and then induces the flow of current.
When a high-resistance voltmeter is connected to an electric circuit, a deflection will arise due to the flow of electricity. Moving the magnet towards the coil of wire will cause the needle of the high-resistance voltmeter to move in one direction. Also, as the magnet is moved out from the coil of wire, the needle of the high-resistance voltmeter moves in the opposite direction.
In this scenario, a magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage doubles because the number of turns (voltage) in the primary winding is directly proportional to the number of turns (voltage) in the secondary winding.
If the number of coils doubles, the induced voltage will be doubled. Option A is correct. Faraday's law of induction is used to describe the induced voltage.
What is induced voltage?The induced voltage is a result of electromagnetic induction. The procedure of producing emf (induced voltage) by exposing a conductor to a magnetic field is known as electromagnetic induction
A magnet is moved in and out of a wire coil connected to a high-resistance voltmeter in this scenario.
Because the number of turns (voltage) in the primary winding is directly proportional to the number of turns (voltage) in the secondary winding, doubling the number of coils doubles the induced voltage.
If the number of coils doubles, the induced voltage will be Doubles.
Hence option A is correct.
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What is the current in a 160 V circuit if the resistance is 2 ohms?
Answer:
Question: What is the current in a 160V circuit if the resistance is 2Ω?
Answer:
Voltage ( V ) = 160V
Resistance ( R ) = 2Ω
Current ( I ) = ?
By Ohms law
⇒ V = IR
⇒ 160 = I × 2
⇒ I = 160 / 2 = 80A
\rule{200}2
Question: What is the current in a 160V circuit if the resistance is 20Ω?
Answer:
Voltage ( V ) = 160V
Resistance ( R ) = 20Ω
Current ( I ) = ?
By Ohms law
⇒ V = IR
⇒ 160 = I × 20
⇒ I = 160 / 20 = 8A
\rule{200}2
Question: What is the current in a 160V circuit if the resistance is 10Ω?
Answer:
Voltage ( V ) = 160V
Resistance ( R ) = 10Ω
Current ( I ) = ?
By Ohms law
⇒ V = IR
⇒ 160 = I × 10
⇒ I = 160 / 10 = 16A
\rule{200}2
Question: Based on questions 2, 3, and 4, what happens to the current in a circuit as the resistance decreases? Increases?
Answer:
From ohms law
⇒ I = V / R
If we take Voltage as proportionality constant
⇒ I ∝ 1 / R
So, we can conclude that current is inversely proportional to resistance.
From 2, 3, 4 questions we can conclude that,
If resistance increases, current decreases and when resistance decreases, current increases.
\rule{200}2
Question: What voltage is required to move 6A through 5Ω?
Answer:
Resistance ( R ) = 5Ω
Current ( I ) = 6A
Voltage ( V ) = ?
By Ohms law
⇒ V = IR
⇒ V = 6 × 5
⇒ V = 30V
\rule{200}2
Question: What voltage is required to move 6A through 10Ω?
Answer:
Resistance ( R ) = 10Ω
Current ( I ) = 6A
Voltage ( V ) = ?
By Ohms law
⇒ V = IR
⇒ V = 6 × 10
⇒ V = 60V
\rule{200}2
Question:What voltage is required to move 6A through 20Ω?
Answer:
Resistance ( R ) = 20Ω
Current ( I ) = 6A
Voltage ( V ) = ?
By Ohms law
⇒ V = IR
⇒ V = 6 × 20
⇒ V = 120V
\rule{200}2
Answer:
80 amps
Explanation:
V = IR
160 volts = I(2 ohms)
I = 80 amps
Which diagram Most accurately represents the effect of the gravitational pull of the moon on earth ocean tides
Answer:
It can't be c because the waves have to be pulled towards the moon.
d looks dodgy. im not sure if its b, but a looks the most promising.
Figure b represents the effect of the gravitational pull of the moon on earth ocean tides.
What is gravitational potential?The effort per unit mass required to move an object from a set reference position to a given place is the gravitational potential at that location. With mass assuming the function of charge, it is comparable to the electric potential.
Gravity is stronger for objects with higher mass. Along with distance, gravity weakens as well. Therefore, the gravitational force of two things becomes stronger the closer they are to one another. The mass of the Earth is what creates gravity. The total gravitational force of all of its mass acts on the mass in your body.
Figure b represents the effect of the gravitational pull of the moon on earth ocean tides.
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A 1750 kg Ford Mustang Convertible and a 2222 kg Dodge Ram 4x4 truck were involved in a head on car crash. The Mustang initially moving at a velocity of 20 m/s rebounds off the truck with a velocity of 12 m/s. After the collision, the Dodge Ram rebounds with a velocity of 5 m/s. What was the velocity of the Dodge Ram before it collided with the Mustang?
Answer:
-1.3 m/s
Explanation:
It won't allow me submit, so be good to check the attachment
Answer:
-1.3 m/s
Explanation:
A sound wave has a speed of
330 m/s and a wavelength of
0.372 m. What is the frequency
of the wave?
(Unit = Hz)
Explanation:
use the formula
speed = frequency x wavelength
330 = frequency x 0.372
330 / 0.372 = frequency
887 Hz = frequency
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Help what is the answer pls
What is the momentum of a 4000g object moving to the left (negative direction) at 25 m/s?
Answer:
-100 kg · m/s
Explanation:
We can find the momentum of an object using the formula:
p = mv where p = momentum (kg * m/s), m = mass (kg), v = velocity (m/s), and p and v are vectorsLet's start by converting the mass of the object to kilograms.
4000 g → 4 kgSince the left direction is the negative direction, we know that the velocity of the object is -25 m/s.
Using these variables, we can solve for p in the formula.
p = mv p = (4 kg)(-25 m/s) p = -100 kg · m/sThe momentum of the object is -100 kg · m/s.
Wat would happen if a feather and a ball were released from the same height at the same time? Gravity Experiments for Kids – Science Experiments for Kids
Answer:
They would land at the same time
Explanation:
They would land at the same exact time.
As weird, impossible and unbelievable as it appears. When in a vacuum, every weight, body and material when released from the same height would land on the ground at the same time. This also means that like in the question, a feather and a ball would land at the same time. And just for illustrations as well, a feather and a car would land at the same time as well.
Describe the series of events that occurs when you place a call from a cordless telephone.
Answer:
you have no internet connection
A car can move from rest to 35 m/s in 5.0 seconds. It's acceleration is
a. 7.0 m/s^2
b. 5.0 m/s^2
c. 4.0 m/s^2
d. 175 m/s^2
Answer:
A) 7.0 m/s²
Explanation:
Acceleration is found by using the formula:
a = Δv/ΔtThis means the change in time divided by the time interval will give us the car's acceleration.
Since the car starts from rest, its initial velocity is 0 m/s. Its final velocity is 35 m/s. The time interval for the car to go from 0 to 35 m/s is 5.0 seconds.
a = (v - v₀)/tSubstitute the final and initial velocity into the formula.
a = (35 - 0)/5 a = 35/5a = 7The acceleration of the car is A) 7.0 m/s².
10 turns of wire are closely wound around a pencil as shown in the figure. when measured using a scale as shown, the length of total turns is obtained 25mm. then a) What is the thickness of the wire? b) Express the thickness of the wire in centimetre.
please write correct answer
Answer:
a. The thickness of the wire is 2.5 mm.
b. The wire is 0.25 cm thick.
Explanation:
Number of turns of the wire = 10
The length of total turns = 25 mm
a. The thickness of the wire can be determined by;
thickness of the wire = [tex]\frac{length of total turns}{number of turns}[/tex]
= [tex]\frac{25}{10}[/tex]
= 2.5 mm
Therefore, the wire is 2.5 mm thick.
b. To determine the thickness of the wire in centimetre;
10 mm = 1 cm
So that,
2.5 mm = x
x = [tex]\frac{2.5}{10}[/tex]
= 0.25 cm
The wire is 0.25 cm thick.
jake climbs up the stairs with some books, his weight is 300N and the books have his weight of 100N. He climbs a height of 30m. How much work is done by her.
Answer:
c
Explanation:
A student creates a model by placing raisins in bread dough and allowing the dough to rise for several hours. The student sketches the model before and after the dough rises.
The student claims that the model accurately describes the motion of the galaxies in the universe. What evidence from the model supports the student’s claim?
As the dough rises, the size of the raisins increases, resembling the expansion of the galaxies.
As the dough rises, the size of the raisins increases, resembling the expansion of the galaxies.
As the dough rises, the size of the raisins increases, resembling the expansion of the galaxies.
As the dough rises, the distance between the raisins decreases, indicating that the galaxies will collide.
As the dough rises, the distance between the raisins decreases, indicating that the galaxies will collide.
As the dough rises, the size of the raisins decreases, resembling the emission of light from stars.
As the dough rises, the size of the raisins decreases, resembling the emission of light from stars.
As the dough rises, the distance between the raisins increases, indicating that the galaxies are moving apart.
As the dough rises, the distance between the raisins increases, indicating that the galaxies are moving apart. D
The evidence from the model supports the student’s claim is as the dough rises, the distance between the raisins increases, indicating that the galaxies are moving apart. The correct option is D.
What is fermentation?Fermentation is an anaerobic chemical process that breaks down molecules like glucose. More specifically, fermentation is the foaming that happens during the creation of wine and beer, a procedure that has been around for at least 10,000 years.
Without the aid of oxygen, fermentation enables cells to generate chemical energy from the breakdown of sugar, such as glucose.
As the dough ferments, carbon dioxide is created and trapped as microscopic air bubbles. It increases as a result. The expansion of carbon dioxide during baking causes the bread to rise higher.
Therefore, the correct option is D, As the dough rises, the distance between the raisins increases, indicating that the galaxies are moving apart.
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What is the net force on an object with a normal force of 750 N and gravity applying 750 N?
Answer:
[tex]Net_{F}[/tex] = 750N - 750N = 0N
Explanation:
The forces are balanced and there is no average Net force
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*A 15000 kg railroad car travels on a horizontal track with a constant speed of 12 m/s. A 6000 kg load is dropped onto the car. What will be the car's speed?
Answer:
8.57 m/s
Explanation:
From the question,
The total momentum of the car before the load was dropped = Total momentum of the call after the load was dropped.
Mu = (M+m)V........................... Equation 1
Where M = mass of the car, u = initial speed of the car, m = mass of the load, V = final speed of the load.
make V the aubject of the equation
V = mu/(M+m)...................... Equation 2
Given: M = 15000 kg, m = 6000 kg, u = 12 m/s,
Substitute these values into equation 2
V = (15000×12)/(15000+6000)
V = 180000/21000
V = 8.57 m/s
what would happen if a paper clip that is not a permanent magnet was brought close to the south pole of a permanent magnet?
Answer:
Because this pole is different from the original pole that magnetized the paperclips, the top paperclip will become demagnetized in the opposite direction and the bottom paperclip will be repelled away
