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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How is speed different from velocity?
Answer:Speed is the time rate at which an object is moving along a path
Velocity is the rate and direction of an object's movement.
Explanation:
Hope it helps
Explain with reason that when sunlight is focused on a piece of paper with the help of a convex len the paper will burn.
Answer:
Convex lenses concentrates the light energy to one spot on the paper so that the heat energy accumulates on that one small spot of paper. ... As the heat increases, combustion will occur when the spot becomes too hot and the paper will burn.
Explanation:
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If you dont mind can you please mark me as brainlest?
The slope of a distance-time graph will give
. While at the dentist’s office, Marion noticed the x-ray images of her teeth looked very
different than a photograph image of her teeth. She recalled x-ray images are
produced from x-rays and photograph images are produced from visible light waves.
What can be inferred about the energy difference between x-rays and visible light
waves?
A. X-rays have higher energy than visible light waves.
B. Visible light waves have higher energy than x-rays.
C. X-rays and visible light waves have the same energy.
D. Visible light waves and x-rays can have varying amounts of energy
Answer:
B
Explanation:
A disturbance that generates a wave may be a simple pulse or shock
True or false
Answer:
That would be true.
-- a bell starts ringing (wave) when you tap it (simple pulse)
-- a pond starts rippling (wave) when a stone drops in (simple shock)
-- a guitar strings starts waving when you pluck it
3. How does the wavelength of green different from violet-indigo?
Answer:
As the full spectrum of visible light travels through a prism, the wavelengths separate into the colors of the rainbow because each color is a different wavelength. Violet has the shortest wavelength, at around 380 nanometers, and red has the longest wavelength, at around 700 nanometers.
Explanation:
A positively charged light metal ball is suspended between two oppositely charged metal plates on an insulating thread as shown below. After being charged once, the plates are disconnected from the battery. Describe the behavior of the ball. Please use 3 content related sentences. (
Answer:
The positive ball would go first to the negatively charged plate.
Explanation:
After which, it would hold a more negative charge. Due to the negative charge, it would travel towards the positive plate. Thereby, it would transfer negative electrons to the positive plate once more. In doing so, it would transfer positive protons to the negative plate. After which, it would hold more negative electrons and be drawn towards the positive plate once more. The Process would continue until the once-positive and once-negative became neutral ( and were discharged.) Additionally, the ball hanging on the insulator thread would also be neutral and discharged.
An arrow is fired downward at an angle of 45 degrees from the top of a 200 m cliff with a velocity of 60.0 m/s.
A.how long will it take the arrow to hit the ground?
B.how far from the base
Answer:
A) 3.39 seconds
Explanation:
A) How long will it take the arrow to hit the ground?We can find the time it takes the arrow to hit the ground by using a constant acceleration equation.
Let's make the positive direction upwards and the negative direction downwards. Let's list out the relevant variables:
v₀ = -60 m/sΔy = -200 ma = -9.8 m/s² t = ?Find a constant acceleration equation that contains these four variables.
Δy = v₀t + 1/2at²Substitute known values into the formula and solve for t.
-200 = (-60 · cos(45))t + 1/2(-9.8)t² -200 = (-30√2)t - 4.9t² 0 = -4.9t² - (30√2)t + 200Use the quadratic formula to continue solving for t.
[tex]\displaystyle \frac{-b \pm \sqrt{b^2-4ac} }{2a}[/tex][tex]\displaystyle \frac{-(-30\sqrt{2})\pm \sqrt{(-30\sqrt{2})^2 -4(-4.9)(200)} }{2(-4.9)}[/tex] [tex]\displaystyle \frac{30\sqrt{2} \pm \sqrt{1800+3920} }{-9.8}[/tex][tex]\displaystyle \frac{30\sqrt{2} \pm \sqrt{5720} }{-9.8}[/tex]From this, when we add the discriminant we get -12.04664168. When we subtract the discriminant we get 3.38819129.
Since time cannot be negative, the time it takes for the arrow to hit the ground must be 3.39 seconds.
Answer:V^2=U^2+2gSIN45S
60^2=2asin45x200
3600=400sin45(a)
3600=282•84a
a=3600/282•84
a=12m/s^2
S=ut+0•5gt^2
200=0•5(12)t^2
200=6t^2
t^2=200/6
t^2=33.33
t=5.77s
Explanation:
Plssss help I need good grade!!!! Plssss and thank u
Answer:
the answer is 'b'
According to me
Answer:
B
Explanation:
It has more negative signs than positive signs
What are 3 items that can be found in each layer of the atmosphere?
Answer:troposphere, stratosphere, mesosphere and thermosphere and exosphere
Explanation:
Is this right? Please help me. ITS SOCIOLOGY!!
Answer:
i think so
Explanation:
physics!!! please help D:
A goose flying south for the winter travels 55 miles directly south east (45 degrees) and then flies at an angle of 35 degrees Northeast for 75 miles. How far and in what direction did the goose travel?
Answer:
Part A
The distance from the start point the goose travels is approximately 84.96 miles
Part B
The direction the goose travel is approximately 71° Northeast
Explanation:
Part A
The distances the goose flies is given as follows;
The distance directly 45 degrees southeast the goose travels, AB = 55 miles
The distance Northeast the goose travels, BC = 75 miles
The angle Northeast the goose travels = 35°
From the attached drawing of the path the goose travels, we have, by cosine rule, the following relation;
a² = b² + c² - 2·b·c·cos(A)
Therefore, we have;
The length of side [tex]\overline{AC}[/tex]² = 55² + 75² - 2 × 55 × 75 × cos(80°) = 7217.40253425
[tex]\overline{AC}[/tex] = √(7217.40253425) ≈ 84.9552972701
The distance from the start point the goose travels ≈ 84.96 miles
Part B
By sine rule, we have;
75/(sin(A)) = [tex]\overline{AC}[/tex]/(sin(80°))
sin(A) = (75/[tex]\overline{AC}[/tex]) × (sin(80°)
∴ sin(A) = (75/84.9552972701) × (sin(80°) = 0.8694052016
∠A = arcsin(0.8694052016) = 60.3895991264° ≈ 60.4°
The direction the goose travel = 180 - 64 - 45 = 71°
∴ The direction the goose travel =≈ 71° Northeast
Wheel and axle gizmos
Answers;
Explanation:
Wheel and axle gizmos answer key
6. Explain how you could increase the potential energy of an object. *
Answer:
a doubling of the height will result in a doubling of the gravitational potential energy.
Explanation:
4. Explain how energy is transformed in a spring.
Answer:
As spring falls in a vertical plane, the change in gravitational potential energy is transformed to elastic potential energy.
Explanation:
To calculate the spring constant, Hooke's law was used, as well as potential energy to calculate the gravitational and elastic potential energy.
This process releases a large amount of . Energy ,oxygen ,or water
Answer:
carbon dioxide i think please be right
It’s due in like 2 hourssss!!
1. A force of 52N acts upon a 4kg block sitting in the ground. Calculate the acceleration of the object (show work)
2. An object of mass 10kg is accelerated upward at 2 m/s^2. What force is required? (Show work)
3. What is the mass of an object if a force of 17N caused it to accelerate at 1.5m/s^2? (Show work)
Answer:
1. Acceleration = 6.25 m/s²
2. Force = 20 Newton.
3. Mass = 11.33 kg
Explanation:
Given the following data;
1. Force = 25N
Mass = 4kg
To find the acceleration;
Acceleration = force/mass
Acceleration = 25/4
Acceleration = 6.25 m/s²
2. Mass = 10kg
Acceleration = 2 m/s²
To find the force required;
Force = mass * acceleration
Force = 10 * 2
Force = 20 Newton.
3. Force = 17N
Acceleration = 1.5 m/s²
To find the mass;
Mass = force/acceleration
Mass = 17/1.5
Mass = 11.33 kg
Speed of a car is 30 m/s. Find its speed in km/h.
110 km/h
5.3 km/h
108 km/h
109 km/h
Answer:
108km/h
Explanation:
1km=1000m
3600s=1 hr
M/s= 3600/1000km/hr= 3.6km/hr
30m/s= 30×3.6km/hr = 108km/hr
A ball is launched horizontally at a speed of 4.0m/s from the top of a cliff that is 24.6 meters high. Where in the ball's trajectory is the horizontal speed a maximum? Explain how you know.
Answer:
The horizontal speed of the ball is constant where there is little resistance from the air
Explanation:
From the given parameters of the ball, we have;
The horizontal speed of the ball = 4.0 m/s
The height of the cliff from which the ball is launched = 24.6 meters
The direction in which the ball is launched = Horizontally
The components of the forces acting on the ball are;
The vertical force = The Earth's gravitational attraction
The horizontal force = 0 N (There are no horizontal forces acting on the ball)
According to Newton's first law of motion, the ball will continue in its uniform motion or in its rest state unless acted upon by a force
Therefore, given that there are no horizontal forces component acting on the ball, (little air resistance) the ball will continue with the initial horizontal velocity, such that the horizontal velocity of the ball remains constant.
A car has a mass of 1500 kg. It is traveling at a speed of 0.52 m/s. What is the kinetic energy of the car?
a.202.8 J
b.202.8
c.390 J
d.390
Answer:
c
Explanation:
3. How did the team of physicists
make the phonon laser?
Answer:
A team led by Nick Vamivakas has now made the levitated optomechanical analogue to the optical laser by expanding on the optical tweezer,By measuring the scattered light, we are then able to alter the way the beads oscillate and increase the output of energy as measured in phonons
Explanation:
what prevents friction
Answer:
control of friction can be done with the help of lubricants
Explanation:
As our Sun exhausts its supply of hydrogen, it will cool down by 1000 to 2000 Kelvin. But it will also become about 100 times brighter than it is now. Describe the path our Sun will take on the HR diagram, and what type of star the Sun will become.
Answer:
It will move upward and to the right, from the main sequence to the giants.
Explanation:
Plato answer so change it up a bit xx
Help pls.!! and explain please
Answer:
so if it's 20 you should put 20 times 10 15 * 30 and 1.3 * 5 mg and if you put that milligrams in there it'll solve the destination I saw the white way you going so yeah just be careful at least you want to make the milligrams even a multimacy with the y i and replace it with the 14a
Which of the following is NOT true about energy?
A. it knocks down bowling pins
B. you can hold it in your hand
C. it moves wind turbines
D. it makes a baseball fly
Answer:
A
Explanation:
if you knock down all the pin with the first ball it is called strike
Explain how do you determine the intensity of earthquake
Answer:
The Richter scale measures the largest wiggle (amplitude) on the recording, but other magnitude scales measure different parts of the earthquake. The USGS currently reports earthquake magnitudes using the Moment Magnitude scale, though many other magnitudes are calculated for research and comparison purposes.
Answer:
To measure the magnitude of an earthquake, the American scientist Charles Richter developed a scale in 1935. Known as the Richter scale, it assigns a number based on the height of the waves on a seismogram (the visual output of a seismograph). Seismographs measure ground motion, including the energy released by an earthquake.
For a converging lens, a ray arriving parallel to the optic axis
a. appears to come from the principal focal point.
b. passes through the principal focal point.
c. passes through the "other" focal point.
d. appears to come from the "other" focal point.
Answer:
b. passes through the principal focal point.
Explanation:
Light wave can be defined as an electromagnetic wave that do not require a medium of propagation for it to travel through a vacuum of space where no particles exist.
A lens can be defined as a transparent optical instrument that refracts rays of light to produce a real image.
Basically, there are two (2) main types of lens and these includes;
I. Diverging (concave) lens.
II. Converging (convex) lens.
A converging lens refers to a type of lens that typically causes parallel rays of light with respect to its principal axis to come to a focus (converge) and form a real image. This type of lens is usually thin at the lower and upper edges and thick across the middle.
For a converging lens, a ray arriving parallel to the optic axis passes through the principal focal point.
The correct option is b. passes through the principal focal point.
The following information should be considered:
Light wave refers to an electromagnetic wave that does not require a medium of propagation for it to travel via a vacuum of space where no particles exist. A lens refers to a transparent optical instrument that refracts rays of light to produce a real image.
Basically, there are two (2) main types of lens:
Diverging (concave) lens: Converging (convex) lensA converging lens refers to a type of lens that typically causes parallel rays of light with respect to its principal axis to come to a focus (converge) and form a real image.
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Water molecules are formed by covalent
bonding. What effect does this have on
the water molecule?
creates a polar molecule with two positive
ends
creates a nonpolar molecule with two positive
ends
creates a nonpolar molecule with one positive
and one negative end
creates a polar molecule with one positive
and one negative end
Answer:
When covalent compounds dissolve in water, they break apart into molecules, but not individual atoms. Water is a polar solvent, but covalent compounds are usually nonpolar. This means covalent compounds typically don't dissolve in water, instead, it makes a separate layer on the water's surface.
Explanation:
I don't understand the second part but hope this helps.
A centrifuge used in DNA extraction spins at a maximum rate of 7000rpm producing a "g-force" on the sample that is 6000 times the force of gravity. If the centrifuge takes 10 seconds to come to rest from the maximum spin rate: a) What is the angular acceleration of the centrifuge? b)what is the angular displacement of the centrifuge during this time
Answer:
A) a = 73.304 rad/s²
B) Δθ = 3665.2 rad
Explanation:
A) From Newton's first equation of motion, we can say that;
a = (ω - ω_o)/t. We are given that the centrifuge spins at a maximum rate of 7000rpm.
Let's convert to rad/s = 7000 × 2π/60 = 733.04 rad/s
Thus change in angular velocity = (ω - ω_o) = 733.04 - 0 = 733.04 rad/s
We are given; t = 10 s
Thus;
a = 733.04/10
a = 73.304 rad/s²
B) From Newton's third equation of motion, we can say that;
ω² = ω_o² + 2aΔθ
Where Δθ is angular displacement
Making Δθ the subject;
Δθ = (ω² - ω_o²)/2a
At this point, ω = 0 rad/s while ω_o = 733.04 rad/s
Thus;
Δθ = (0² - 733.04²)/(2 × 73.304)
Δθ = -537347.6416/146.608
Δθ = - 3665.2 rad
We will take the absolute value.
Thus, Δθ = 3665.2 rad
