Wavelength is the distance between 2 adjacent points in a wave
we can use the following equation to find the wavelength of a sound wave
wavelength = speed / frequency
frequency is the number of waves passing a point in 1 second
substituting the values in the equation
wavelength = 343 m/s / 686 Hz
wavelength = 0.5 m
wavelength of the wave is 0.5 m
The wavelength of a sound wave with a frequency of 686 Hz traveling through air with a speed of 343 m/s is calculated using the formula extlambda = v / f, which gives a wavelength of 0.5 meters.
To find the wavelength of a sound wave with a given frequency, you can use the formula:
v = f imes ext{ extlambda}
Where v is the speed of sound in the medium, f is the frequency, and ext{ extlambda} (lambda) is the wavelength. Given that the speed of sound (v) in air is 343 m/s and the frequency (f) of the wave is 686 Hz, we can rearrange the equation to solve for the wavelength ( ext{ extlambda}):
ext{extlambda} = v / f
Plugging in the values:
ext{extlambda} = 343 m/s / 686 Hz
ext{extlambda} = 0.5 m
So, the wavelength of a sound wave with a frequency of 686 Hz traveling through air at a speed of 343 m/s is 0.5 meters.
if a 6kg ball is hanging by a rope from the ceiling at rest, what is the tension of the rope?
Answer:
58.8 N
Explanation:
Since the ball is hanging at rest, the net force on the ball must be zero.
There are only two forces acting on the rope:
- Its weight, downward, given by W = mg, where m = 6 kg is the mass of the ball and g=9.8 m/s^2 is the acceleration due to gravity
- the tension in the rope, T, upward
Therefore, the equation for the forces is:
[tex]T-W=0[/tex]
And solving for T, we find:
[tex]T=W=mg=(6 kg)(9.8 m/s^2)=58.8 N[/tex]
If a light Ray is aimed so that it bounces off a metal drain in a pool, the light Ray will reflect off the drain according to ? A) shells law B) the law of reflection C) the law of refraction D) the law of incidence
Answer:
B) the law of reflection
Explanation:
When a light ray reflects off a surface, it obeys the law of reflection.
A few definitions before giving the law of reflection:
- The angle of incidence is defined as the angle between the incident ray and the normal to the surface
- The angle of reflection is defined as the angle between the reflected ray and the normal to the surface
The law of reflection states that:
- The angle of incidence is equal to the angle of reflection
- The incident ray and the reflected ray lie both on the same plane.
The efficiency of a device such as a lamp can be calculated using this equation:
efficiency = (useful energy transferred ÷ energy supplied) × 100
Using the formula, calculate the efficiency of the lamp shown in the diagram above.
A) 7%
B) 25%
C) 70%
D) 75%
Answer: C- 70%
Explanation:
Useful energy = 250J-75J = 175J
175J/250J*100= 70%
Efficiency should always be less than 1 or below 100% because every device wastes some energy. You committed a calculating error if you receive a result that is more than 1 or 100% Thus option C is correct.
What efficiency of a device as a lamp can be calculated?Efficiency refers to how effectively a technology converts energy input into usable energy output. The percentage of energy delivered in beneficial ways determines a device's efficiency. Either a decimal or a percentage can be used to represent the efficiency.
Any efficiency can be determined by dividing the energy input by the energy output by 100%. This equation serves as a general representation of energy in the form of heat or power.
Therefore, Useful energy = 250J-75J = 175J 175J/250J×100= 70%
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When using the magnification equation, a value greater than 1 as the solution for M indicates that the image is
larger than the object.
smaller than the object.
real.
virtual.
Answer:
Larger than the object
Explanation:
The magnification of a lens/mirror is given by the equation:
[tex]M=-\frac{h_i}{h_o}[/tex]
where
[tex]h_i[/tex] is the size of the image
[tex]h_o[/tex] is the size of the object
from the formula, we see that if M is greater than 1, it means that [tex]|h_i|>|h_o|[/tex]
and so, it means that the image is larger than the object.
The negative sign simply tells if the image is upright or inverted: when M is positive, the image is upright, when M is negative, the image is inverted.
Answer:
Larger than the object
Explanation:
How does a star’s life begin?
THE LIFE OF A STAR
The star starts as a NEBULA basically like this really pretty universal gas. The gas then starts to attract to each other and sticks around together. In the universe the temperature may vary. When the temperatures are extremely high there is a REACTION aka FUSION that takes place.
Then THERE IS A STARR
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.
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.
Plants make their own food using energy from the Sun, carbon dioxide from the air, and
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!
a screwdriver with a 1-cm shaft and a 4-cm handle is used to tighten a screw calculate the mechanical advantage
Mechanical advantage = 4
Explanation;Screwdriver is a type of wheel and axle and the mechanical advantage of a wheel and axle depends upon the size of the wheel compared with the size of the axle.To calculate the mechanical advantage of a wheel and axle, you take the radius of the wheel, (which is the distance from the center of the wheel to the outside edge), and divide it by the radius of the axle.In this case;
Radius of the screwdriver’s handle = 4 cm
Radius of the shaft = 1 cm
Therefore,
Ideal mechanical advantage = 4 cm/1 cm
= 4
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 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.
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 :)
During which month will Europe and Africa each have equal amounts of sunlight?
The answer is March because they are have an equal amount of sunlight in the vernal equinox which is during the month March.
Answer: March and September
Explanation: Equinox is a term that is related to the position of the Earth in relation to the Sun, and this is a short period of time when the plane of the equator passes through the center of the Sun. This happens twice a year and there are spring and autumn equinoxes, more specifically around March 20 and September 23, and then, thanks to the position of the Earth's equator in relation to the center of the Sun, the amount of sunlight is the same in Africa and Europe. So in March and in September.
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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Materials such as oil and gas are used as fuel because they have what chemical property?
Among the most important characteristics of fuels is their heating value.
oil and gas have relatively high heating values as compared to other locally available materials. they are also easy to burn as they are highly inflammable.
ignition takes less time due to this property.
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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A negative charge is moving across a room from south to north. A magnetic field runs from east to west. In what direction is the magnetic force on the moving negative charge?
A.
toward the east
B.
toward the west
C.
toward the floor
D.
toward the ceiling
Answer:
plato answer is c?
Explanation:
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]
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.
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!
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
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
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.
Which object has the greatest gravitational attraction ?
Jupiter is the largest planet in our Solar System. Hence, Jupiter has the greatest gravitational attraction in our Solar System.
What is gravity?Gravity is a fundamental interaction in physics that produces attraction between all objects with mass or energy. Of the four fundamental interactions, gravity is by far the least powerful; at the level of subatomic particles, it makes no difference at all.
The motion of planets, stars, galaxies, and even light is controlled by gravity, which is the most important interaction between things at the macroscopic level.
Strength of gravitational force an be expressed as:
E = GM/r²
Where G = universal gravitational constant and M = mass of the planet; r = distance between the planet and the object.
As Jupiter is the largest planet in our Solar System, Jupiter has the greatest gravitational attraction in our Solar System.
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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 temperature of a gas in which the atoms are moving very, very slowly? Question 9 options: cold hot room temperature
The temperature of the gas will be cold, because the atoms move very slow,
Answer:
cold
Explanation:
According to kinetic theory of gases, gases at same temperature have same kinetic energy. The speed (v) of the particles of the gas is directly proportional to the temperature (T) of the gas.
K.E. ∝ T
v ∝ T
In the given situation, the atoms of gas are moving very slowly. This means that the temperature of the gas must be very low. The temperature of the gas would be cold.
Which is a tool used by scientists to determine the composition of objects?
A. a hologram
B. a spectrometer
C. a wave front
D. a prism
Answer:
Its B
Explanation:
edg2020
Spectrometer is the tool used by scientists to determine the composition of objects. So, option B is correct.
What is meant by spectroscopy ?Spectroscopy is defined as the technique of studying the structure and properties of matter by using radiations.
Here,
The method of spectroscopy is that it analyses matter by using radiations. In this process, the radiations emitted and absorbed by the particles are analyzed. The instrument used is called spectrometer. Thus the absorption spectra and emission spectra of the particle are obtained. From this, the interaction of the particle with the materials in form of energy can be studied. Spectroscopy can be called as the measurement of the matter-energy interactions by means of radiation and their wavelengths as the function of energy. Spectroscopy and its applications have been widely used in many of the theories in physics. Quantum mechanics and relativity theories and many others has been developing their theories by the major applications of spectroscopy. Study of material particles are widely done by spectroscopy
Hence,
Spectrometer is the tool used by scientists to determine the composition of objects.
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