Answer: Each consecutive disturbance has a further distance to travel before reaching observer A. For this reason, observer A observes a frequency of arrival that is less than the frequency at which the disturbances are produced.
Explanation:
The Doppler Effect
Suppose that there is a happy bug in the center of a circular water puddle. The bug is periodically shaking its legs in order to produce disturbances that travel through the water. If these disturbances originate at a point, then they would travel outward from that point in all directions. Since each disturbance is traveling in the same medium, they would all travel in every direction at the same speed. The pattern produced by the bug's shaking would be a series of concentric circles as shown in the diagram at the right. These circles would reach the edges of the water puddle at the same frequency. An observer at point A (the left edge of the puddle) would observe the disturbances to strike the puddle's edge at the same frequency that would be observed by an observer at point B (at the right edge of the puddle). In fact, the frequency at which disturbances reach the edge of the puddle would be the same as the frequency at which the bug produces the disturbances. If the bug produces disturbances at a frequency of 2 per second, then each observer would observe them approaching at a frequency of 2 per second.
Now suppose that our bug is moving to the right across the puddle of water and producing disturbances at the same frequency of 2 disturbances per second. Since the bug is moving towards the right, each consecutive disturbance originates from a position that is closer to observer B and farther from observer A. Subsequently, each consecutive disturbance has a shorter distance to travel before reaching observer B and thus takes less time to reach observer B. Thus, observer B observes that the frequency of arrival of the disturbances is higher than the frequency at which disturbances are produced. On the other hand, each consecutive disturbance has a further distance to travel before reaching observer A. For this reason, observer A observes a frequency of arrival that is less than the frequency at which the disturbances are produced. The net effect of the motion of the bug (the source of waves) is that the observer towards whom the bug is moving observes a frequency that is higher than 2 disturbances/second; and the observer away from whom the bug is moving observes a frequency that is less than 2 disturbances/second. This effect is known as the Doppler effect.
Answer:frequency increases
a player passes a 0.600kg basketball down court for a fast break.the ball leaves the player hands with a speed of 8.30m/s and slows down to 7.20 m/s at its highest point. Ignoring air resistance,how high above the release point it is at its maximum height?
At the release point, the ball has kinetic energy,
[tex]\dfrac12m{v_0}^2[/tex]
and at its maximum height it has potential and kinetic energy,
[tex]-mgy+\dfrac12mv^2[/tex]
where [tex]y[/tex] is the maximum height attained above the release point.
The LoCoE tells us that we should have
[tex]\dfrac12m{v_0}^2=-mgy+\dfrac12 mv^2[/tex]
[tex]\implies v^2-{v_0}^2=-2gy[/tex]
[tex]\implies\left(7.20\dfrac{\rm m}{\rm s}\right)^2-\left(8.30\dfrac{\rm m}{\rm s}\right)^2=-2\left(9.80\dfrac{\rm m}{\mathrm s^2}\right)y[/tex]
[tex]\implies y=0.870\,\mathrm m[/tex]
Answer: The maximum height of the ball is 0.87 m
Explanation:
To calculate the height of the ball, we use third equation of motion:
[tex]v^2-u^2=2as[/tex]
where,
s = distance traveled / height of the ball = ?
u = initial velocity of the ball = 8.30 m/s
v = final velocity of the ball = 7.20 m/s
a = acceleration due to gravity = [tex]-9.8m/s^2[/tex] (negative sign represents the ball is going upwards that is against gravity)
Putting values in above equation, we get:
[tex](7.20)^2-(8.30)^2=2\times (-9.8)\times s\\\\s=\frac{(7.20)^2-(8.30)^2}{(2\times (-9.8))}=0.87m[/tex]
Hence, the maximum height of the ball is 0.87 m
how are power ratings used to describe machines?
power ratings basically just compare with how many watts are used, like a tackle in football compares to a car engine
For historical reasons, the horsepower is occasionally used to describe the power delivered by a machine. One horsepower is equivalent to approximately 750 Watts. ... Thus, the power of a machine is the work/time ratio for that particular machine. A car engine is an example of a machine that is given a power rating.
Compare and contrast velocity and speed
Velocity and speed are basically the same thing but velocity has a direction and speed does not. Both are the rate at which something or someone moves :)
What do radio waves carry
The answer is modulation. In modulation a radio wave (also called the "carrier signal") is changed by the signal we want to send to the receiver, for example a song, or, in a wireless network, some data from a computer.
Answer:
Radio waves carry conversations, music, pictures, and information.
Explanation:
The handle of a metal spoon warms up when it is placed in a hot bowl of soup because of
radiation.
conduction.
convection.
insulation.
conduction because energy is being conducted throughout the spoon
The handle of a metal spoon warms up when it is placed in a hot bowl of soup because of conduction.
Explain the process of conduction?Heat is transferred from the hot water to the cold water until both samples have the same temperature. The transfer of heat from the hot water through the metal can to the cold water is referred to as conduction. Conduction involves the transfer of heat from one location to another.When a point on an object is heated, the molecules there vibrate more strongly. Conduction is the transfer of these vibrations within the material.By the process of Conduction the handle of a metal spoon become warm.
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Which statement is true of a concave lens?
The list of choices you gave us doesn't have any true statements on it.
The statement true of a concave lens is Option A.
What is concave lens?Concave lens is a type of spherical lens which is polished from outside and it reflects the light coming from the object through its inner surface.
This lens is diverging in nature which means that the light rays gets diverged after reflection.
The nature of the image formed by these lens is virtual and the size of the image will be less than the object and the image formed will be upright.
Hence, the correct option is A.
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what is the weight of 0.12kg mass?
1.1772 N
Step by Step ExplanationGiven in the question,
mass of an object = 0.12 kg
To find the weight of this object we will use formula
weight = mass x acceleration due to gravity
We know that acceleration due to gravity on earth is constant = 9.81 m/s²
So,
weight = 0.12 x 9.81
= 1.1772 N
Since it is not mention that were the object is so i assume that it is on earth but if it is on moon then acceleration due to gravity will be 1.625 m/s²
Approximately how many years has the sun been active? 3.5 billion 4.5 billion 5.5 billion 6.5 billion
5.5 billion
Hope this helps :)
According to science its 5 billion years
And This Isn't in your option so we can say 4.5 billion years.
how does a pedometer help people reach their fitness goals
how does a pedometer help people reach their fitness goals?
a. It measures calories burned.
b. It usually doubles as an MP3 player and keeps people motivated.
c. They count steps during a workout.
d. They measure the number of lifts done per exercise.
Answer:
By counting the steps it allows you to know the distance you have walked or ran.
Explanation:
A pedometer is an instrument that estimates the distance traveled by foot. It does this by recording the number of steps walked.
Some pedometers apps also have a feature that counts the calories burnt and lets you set the number of steps and calories you need to burn daily.
I hope this answer helps you.
How much work is done if 10 N is applied to a 5kg object for 10 meters if there is an opposing force of 5 N
Answer:
50 J
Explanation:
The net force acting on the box is given by the algebraic sum of the two forces, so:
[tex]F=10 N -5 N = 5 N[/tex]
The net work done on the box is equal to (assuming the net force is parallel to the displacement of the object)
[tex]W=Fd[/tex]
where
F = 5 N is the net force on the object
d = 10 m is the displacement of the object
Substituting,
[tex]W=(5 N)(10 m)=50 J[/tex]
Please hurry
Which facility relies on a nonrenewable source of energy?
f A wind farm that uses wind turbines
g A dam that uses the power of water
h A solar farm that collects sunlight
j A power station that burns coal
power station that burns coal
Non- renewable source of energy is exhaustible resources. The facility relies on a non-renewable source of energy is a power station that burns coal.
What is Non- renewable source of energy?These are the sources that cannot be produced again if exhausted once. They may take millions of years to form. Such as coal, and natural gas.Renewable sorces:
These are the source of energy that is present in inexhaustible amounts. Such as solar energy, water dams, wind power.Therefore, the facility relies on a non-renewable source of energy is a power station that burns coal.
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the amount of force needed to keep a 0.2 kg hockey puck moving at a constant speed of 8m/s on friction less ice is ____ N
If there is really no friction and no air resistance, then NO force is needed to keep an object moving in a straight line at constant speed. Check out Newton's first law of motion again.
Answer:
F = 0 N
Explanation:
Given that,
Mass of the hockey puck, m = 0.2 kg
Speed of hockey puck, v = 8 m/s
As the speed is constant. So, there is no change in the velocity. As a result, the acceleration of the hockey puck is 0. Force is given by :
[tex]F=ma[/tex]
Since, a = 0
F = 0
So, the amount of force needed to keep a 0.2 kg hockey puck moving at a constant speed of 8 m/s on friction less ice is zero newton.
a 15 year old broke into a store with his buddies one of the older boys shot and killed the store owner what the text says about the criminal justice system the 15 year old
light is an example of a mechanical wave in nature? true or false
Answer:
The answer is False.
Explanation:
The Light is a form of energy ( known as luminous energy ) that can be perceived by the human eye, therefore it allows us to see what surrounds us. Light is an electromagnetic radiation that spreads in the form of spherical waves in any space, consequently, it is not a mechanical wave.
Answer:
The answer is False.
which events cause ferromagnetic materials to magnetize and which events cause them to demagnetize. sort events into the correct category.
ANSWERS BELOW!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Magnetize;
1) place in magnetic field
2) pass electricity through
3) rub on permanent magnet
Demagnetize;
1) heat
2)strike
3)place in opposite polarity
Magnetize;
2 3 1
Demagnetize;
3 1 2
magnetize :
place in magnetic field,
rub on permanent magnet,
pass electricity through
demagnetize :
place on opposite polarity,
strike,
heat
What type of energy is related to the kinetic energy of all the particles of a sample of matter?
Particles are objects in motion, so they have kinetic energy. The faster a particle moves, the more kinetic energy it has. Kinetic energy is related to heat. I hope this helps!
Which statement best defines syntax? A. It is the study of words. B. It is the study of the organization of words into sentences, phrases, and clauses. C. It is the study of a long stretch of a language. D. It is the study of sentences.
b would be the best answer
Answer: B. It is the study of the organization of words into sentences, phrases, and clauses.
Explanation:
A syntax in linguistics can be define as the set of rules, processes, principles that is used to frame and govern the sentences in a particular language. It gives the knowledge of the order, arrangement and framing of the words, punctuation in phrases, clauses and sentences, so as to make them meaningful and understandable.
Normal force is exerted _____to the surface of an object.
A. perpendicular
B. 45 degrees
C. horizontal
The normal force is always (underline, bold) is always perpendicular to the surface an object is sitting on. If the object is on an inclined plane, then the normal will not be vertical but it will be perpendicular to the angle of the incline.
The diagram below (left) shows a normal force (GH) that is not vertical, but it is perpendicular to the surface. The object on the right is the more usual normal a mass on a table top.
The vertical line on the right is the normal and it points up.
The correct option is A. perpendicular
Explanation:In Physics, the normal force is the component of a contact force that is perpendicular to the surface that an object contacts. It is the support force exerted upon an object that is in contact with another stable object. Normal Force will be always acting opposite to the force falling on the surface. For example, if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book.
Plants make their own food using energy from the Sun, carbon dioxide from the air, and
Meteoroids that strike Earth are called _____.
meteorite is when a meteor survives the earth atmosphere and Impacts the earth successfully.
The little stone while it's still in space . . . "meteoroid" .
The streak of light it makes shooting through atmosphere . . . "meteor" .
The piece of it that's left when it gets to the ground . . . "meteorite" .
In which situation is the gravitational force between two objects hard to detect? (Options)
a. If the mass of each object is very small.
b. If the objects are very close together.
c. If the mass of one of the objects is very great.
d. If the mass of both objects is very great.
Answer:
Hence, the correct option is (A) "If the mass of each object is very small".
Explanation:
The gravitational force between two objects is directly proportional to the product of masses and inversely proportional to the square of the distance between them.
The mathematical expression is given by :
[tex]F=G\dfrac{m_1m_2}{d^2}[/tex]
d is the distance between masses
Gravitational force is one of the fundamental force in the universe. If the masses of objects is too small, then their interaction with each other is hard to detect.
Hence, the correct option is (A) "If the mass of each object is very small".
Are the wires ever empty of charge? (5 points) Yes No
Yes without an eletrical current attached there would be no electrons.
The wires are empty of charge when there is no current flowing and no electrons moving through wire.
What is charge?The charge is the physical quantity which defines the object's electric field. The charged objects creates the electric field around it and attracts or repels another objects coming into that field.
The like charges repels each other and unlike charges attract each other.
When a wire is connected with battery or voltage source and switch is on, the electrons leave from positive terminal and heading towards the negative terminal. Thereby, resulting in flow of current through wire.
Charge q = no of electrons x charge on electrons
Thus, Yes, wires are ever empty of charge.
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In Niels Bohr's model of the atom, electrons move
Answer:
they move in an orbit of a fixed size and also energy
Answer:
the electrons move by describing circular orbits around the nucleus.
Explanation:
The main characteristic of the Bohr model is that the electrons are located around the nucleus at certain determined distances. Bohr's model is simple and similar to Copernicus' planetary model, where the planets describe circular orbits around the Sun. The electron in an atom describes circular orbits, but the radii have fixed values.
PLEASE HELP ASAP!!! 40 POINTS AND BRAINLIEST TO FASTEST AND BEST ANSWER!!!
DO NOT ANSWER IF YOU DO NOT KNOW!!!
Ben made the following bar graph shown to represent the relative distances of four different astronomical bodies from Earth.
If A represents the sun, which of the following could be represented by C and D?
C could be Venus, and D could be the moon.
C could be Uranus, and D could be the moon.
C could be the moon, and D could be Venus.
C could be Uranus, and D could be Venus.
The answer is C could be the moon, and D could be Venus. ;)
The answer is C could be the moon, and D could be Venus Good looks out there
At what point in its motion is the KE of a pendulum bob a maximum? 1. The KE does not change. 2. at the lowest point 3. at the highest point 4. midway between the highest and lowest points
Answer:
2. at the lowest point
Explanation:
The motion of the pendulum is a continuous conversion between kinetic energy (KE) and gravitational potential energy (GPE). This is because the mechanical energy of the pendulum, which is sum of KE and GPE, is constant:
E = KE + GPE = const.
Therefore, when KE is maximum, GPE is minimum, and viceversa.
So, the point of the motion where the KE is maximum is where the GPE is minimum: and since the GPE is directly proportional to the heigth of the bob:
[tex]GPE=mgh[/tex]
we see that GPE is minimum when the bob is at the lowest point,so the correct answer is
2. at the lowest point
Final answer:
The kinetic energy of a pendulum is maximum at the lowest point of its swing, where potential energy has been fully converted into kinetic energy.
Explanation:
The kinetic energy (KE) of a pendulum bob is at its maximum at the lowest point of its swing. This is because, as the pendulum falls from its highest point, it converts potential energy into kinetic energy. At the lowest point, all the potential energy that was present at the top has been transformed into kinetic energy, assuming no energy losses due to air resistance or friction. Conversely, at the highest points in the swing, the pendulum has maximum potential energy and minimum kinetic energy. Midway between the highest and lowest points, the pendulum has a mix of both kinetic and potential energy.
two wires a and b have equal lengths and are made of same material. If the diameter of wire A is twice that of wire B, which has the greater extension for a given load?
Answer:
It should be A.
Explanation:
Wire A and wire B are made from the same material and have the same length, however, wire A is wider which would allow more electricity or power to be transformed.
Unless im understanding your question wrong, but from what I do understand it is most likely A.
Hope this helps, could you mark me brainliest if it is right?
A force of 2 newtons is required to stretch a spring 4 cm. The amount of force required to stretch the same spring 8 cm is _____ newton(s)
a) 1
b) 2
c) 4
d) 8
Answer will be c for this one!
A car weighs 1323 N. What is it’s mass?
The weight is the product of the mass [tex]m[/tex] of the body and the gravity acceleration [tex]g[/tex]:
[tex]W=m.g[/tex] (1)
Where [tex]g[/tex] is the acceleration due gravity with a value of [tex]9.8\frac{m}{s^2}[/tex] for the Earth
If we want to find the mass, we have to find [tex]m[/tex] in equation (1):
[tex]m=\frac{W}{g}[/tex] (2)
[tex]m=\frac{1323N}{9.8\frac{m}{s^2}}[/tex] (3)
Finally:
[tex]m=135kg[/tex]
what is the difference between transformation of energy and transfer of energy
Transformation of energy involves converting energy from one form to another, while transfer of energy involves the movement of energy from one system to another without a change in form.
Explanation:The difference between transformation of energy and transfer of energy lies in the change of form and location of energy. Transformation of energy refers to the conversion of energy from one form to another, such as chemical energy being transformed into heat energy through metabolism. Transfer of energy, on the other hand, refers to the movement of energy from one system to another without a change in form, like the transfer of electrical energy to light energy in a light bulb.
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Which describes how to compare the energy of two different waves?
A. measure their frequencies
B. measure their periods
C. measure their amplitudes
D. measure their wavelengths
C. measure their amplitudes
Explanation;The amount of energy in a wave is related to its amplitude and its frequency.The amplitude of a wave is how the wave is measured from the rest position or mid-line to the top of a crest or bottom of a trough, measured in meters.A high amplitude wave is a high-energy wave, and a low-amplitude wave is a low-energy wave. For instance in the case of sound waves, a high amplitude sound will be loud, and a low amplitude sound will be quiet.C measures their amplitudes. Hope this helps! :)