The speed of sound in an air at 20°C is 344 m/s. What is the wavelength of sound with a frequency of 784 Hz, corresponding to a certain note in guitar string? a. 0.126 m b. 0.439 m C. 1.444 m d. 1.678 m

ν = RT / PM = RT / P where R is the ideal gas constant, T is temperature, P is pressure, and M is the molarity.

The calculation of the required air volume requires the volume of the room, which derives from the formula room volume = length(m) x width(m) x height(m) and the purpose of the room that indicates the air change rate (ACH).

When heat transfer is involved, use this formula: change in temperature = Q / cm to calculate the change in temperature from a specific amount of heat added. Q represents the heat added, c is the specific heat capacity of the substance you're heating, and m is the mass of the substance you're heating.

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The object depicted by the graph initially moves at a speed of 25 m/s.

The rate at which the position of an item changes with respect to time is represented by the vector quantity known as velocity. It is calculated by dividing an object's displacement by the time period during which the displacement took place.

Velocity is a phrase used to more simply define the direction and speed of an object's motion. Both the direction and the speed of an object's motion are specified. The International System of Units (SI) uses metres per second (m/s) as the standard unit for measuring velocity.

We must look at the behaviour of the graph before to time 1 second in order to ascertain the initial velocity of the object the graph represents.

From the graph provided,

From the given graph, We can see that from time 0 to time 1 second, the velocity is 25 m/s and stays that way.

As a result, the object's starting velocity is 25 m/s.

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The intersection of the sphere with the yz- plane will be (y -z)² + (z- 5)² =7

A sphere is can be define as , a geometrical object that has a three-dimensional analogue to a two-dimensional circle. In a very simple word, i.e. a sphere is the set of points that are all at the same distance r from a given point in three-dimensional space.

We are given that ,

The center of sphere = (h, k, l) = (-3,2,5)

The radius of sphere = (r) = 4

Then the formula of the equation of sphere with radius r and center (h, k, l) is given as,

(x- h)² +(y - k)² + ( z -l)² = r²

So that putting the value of center of sphere (h, k, l) and radius (r) in above equation then we get,

(x- (-3))² +(y - 2)² + ( z -5)² = 4²

(x +3 )² +( y - 2)² + ( z -5)² = 16

Therefore, we can write the equation of intersection of the sphere with the yz- plane and putting (x = 0) in above equation then,

(0 +3 )² +( y - 2)² + ( z -5)² = 16

( y - 2)² + ( z -5)² = 16 - 9

( y - 2)² + ( z -5)² = 7

The intersection of the sphere with the yz- plane is, (y -z)² + (z- 5)² =7

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Answer:

&3?.&.)/&282/8//8338/.)9

Explanation:

Slow cooling of magma beneath the surface of Earth

Rocks with light and dark color and coarse texture can form in a variety of ways, depending on the specific type of rock. However, one common way that this type of rock can form is through a process called igneous rock formation.

Igneous rocks are formed when molten rock (magma) cools and solidifies. The type of igneous rock that forms depends on the composition of the magma and the rate at which it cools. When magma cools slowly beneath the Earth's surface, it can crystallize and form large, coarse-grained igneous rocks called plutonic or intrusive rocks.

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#1

#2

No it happens opposite as heat transfers from high to low

#3

#4

No it can't be happened in vaccum

#5

#6

Faster the movement faster the heat transfer

#7

Light particles get transferred from low to high (sun light)

#8

#9

Answer:

c and d

Explanation:

The wave shown in the figure is Sound waves. The sound wave is a mechanical wave. Hence, options C and D are correct.

Sound is traveled by means of vibrations of particles in the medium. Sound waves require a medium to propagate. The energy propagation by means of adiabatic loading and unloading is called sound or acoustic waves.

The sound waves produce compression and rarefaction in the air. The sound waves are called Longitudinal waves because the direction of propagation is parallel to the vibration of particles.

Sound waves are considered only as waves because they exhibit a wave nature. Light has both properties of wave and particle. Light is an electromagnetic wave and it is transverse in nature.

The sound waves require a medium like air, water, solids, etc for propagation. Hence it is called Mechanical waves. Light waves do not require a medium to propagate. From the given wave pattern,  it exhibits the property of sound waves.

Hence, the correct option is C) the wave is a mechanical wave, and D) the wave could be transmitting sound.

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Cepheid variable stars are important to astronomers because their periods of variability are related to their absolute luminosity.

A Cepheid variable is a particular kind of variable star that pulses radially and undergoes changes in temperature and diameter. With a well defined, constant period and amplitude, its brightness varies. Cepheid variable stars are a unique class of variable star because they are hot, massive, and have a propensity to pulse radially. They also have a tendency to change in diameter and temperature.

An objective way to quantify the radiant power that a light-emitting device emits over time is luminosity. The total quantity of electromagnetic energy released by a star, galaxy, or other celestial object in a given amount of time is measured as luminosity in astronomy.

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The combination of effects will result in: Option C : the steady-state creep rate increases, the instantaneous strain at the time of application decreases, and the rupture lifetime decreases.

The pressure on the material per unit area is known as the stress, and the deformation that results from this stress is known as the strain. Because strain only results from stress, the two concepts are intimately linked.

The level of stress that can occur generally increases with temperature change.

The resulting stress is known as thermal stress when the applied force takes the form of temperature. It happens whenever a change in temperature causes an object to enlarge or contract. We can define thermal stress as "stress brought on by a change in temperature" as a result.

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Answer:

The Kinetic energy and mass are _directly_ proportional.

Explanation:

We know that Kinetic Energy is basically termed as the capacity of a body to do work.

Kinetic energy is often used to associate with moving objects, therefore, K.E is normally termed as the energy of motion.

The formula of K.E of an object of mass and velocity is defined

K.E = 1/2mv²

From the formula, it is clear that K.E is directly proportional to its mass and also directly proportional to the square of its velocity.

For example,

If A toy plane with a mass of 10 kg is flying at 20 m/s. Its K.E will be:

K.E = 1/2mv²

      = 1/2(10)(20)²

      = 1/2(10)(400)

       = 5(400)

      = 2000 J

Now, let suppose, if we double the mass of a toy plane i.e.

m = 20 kg

so

K.E = 1/2mv²

      = 1/2(20)(20)²

      = 1/2(20)(400)

      = 10(400)

      = 400 J

Therefore, the K.E is doubled when doubled the mass.

Therefore, the Kinetic energy and mass are _directly_ proportional.

Answer:

directly

Explanation:

Answer:

A tidal is a type of wave is most affected by gravity from the sun and the moon.

Explanation:

I hope it helps ❤❤

Tidal wave is the type of wave which is most affected by gravity from the

Sun and the moon

The sun and the moon's gravitational pull results to the tidal force being

generated. The tidal force from the tidal wave generated has some effects

on the earth.

It causes the  Earth and its water content to bulge out on two sides of the

earth. It bulges in the area with the highest proximity to the moon and areas

with the lowest proximity. This is responsible for the formation of high tides

in  water bodies.

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Answer:

The measurement of an object's motion with respect to any other object that is moving or stationary is called Relative Motion.

The collision occurred at a height that is 8/9 of the height of the building. This problem involves the concepts of kinematics and conservation of energy.

Let's assume that the height of the building is h, and the speed of ball b just before the collision is v. Since ball a is dropped from rest, its initial velocity is 0.

We know that at the time of collision, the velocity of ball a is three times the velocity of ball b, and their directions are opposite. Therefore, the velocity of ball a is -3v, and the velocity of ball b is v.

Let's find the time it takes for each ball to reach the collision point.

For ball a, using the equation of motion for constant acceleration:

h = (1/2)at²

where a is the acceleration due to gravity, which is approximately 9.8 m/s², and t is the time it takes for ball a to reach the collision point.

Solving for t, we get:

t = √(2h/9.8)

For ball b, using the equation of motion for constant acceleration:

v = u + at

where u is the initial velocity, which is upward for ball b, and a is the acceleration due to gravity. We know that v = -3v at the collision point, so:

-3v = u - 9.8t

Solving for t, we get:

t = (4/3)v/9.8

Now we can equate the two expressions for t and solve for h:

√(2h/9.8) = (4/3)v/9.8

h = (8/9)v²

Therefore, the collision occurred at a height that is 8/9 of the height of the building.

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A car is travelling along a country road that resembles a roller coaster truck. If car travels with uniform speed, the force exerted by road on the car is maximum at A.

Option A is correct.

We can  determine the force exerted by the road on the car  by taking into consideration the direction of the net force acting on the car which is the force exerted by the road on the car is due to the normal force, which is perpendicular to the road surface.

The car is at the bottom of the roller coaster-like track at position A. We notice that the normal force from the road acts in the upward direction which is in  opposition to the gravitational force on the car.

The force exerted by the road on the car is maximum at position A, hence the net force on the car is directed upward.

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Answer:

45000 kg and 45 tons  

Explanation:

The expression in kilograms and tons is shown below;

As we know that

1 gr is 0.001 kg

So, 45000000 = 45,000 kg

And,

1 kg = 0.001 tons  

So, 45000 kg = 45 tons    

Therefore the same would be considered

The maximum kinetic energy of the photoelectrons emitted when photons with a wavelength of 295 nm are incident on a metal with a work function of 3.07 eV is approximately -0.96 eV.

To calculate the maximum kinetic energy of photoelectrons emitted when photons with a wavelength of 295 nm (nanometers) are incident on a metal with a work function of 3.07 eV (electron volts), we can use the following equation:

Kinetic energy of photoelectrons = Energy of incident photons - Work function First, let's convert the wavelength from nanometers to  meters:Wavelength = 295 nm = 295 × \(10^{-9}\) m

The energy of a photon can be calculated using the equation: Energy of a photon = hc / λ Where: h is Planck's constant (approximately 6.63 × 10(-34) J•s) c is the speed of light in a vacuum (approximately 3 × 10 m/s) λ is the wavelength of the photon

Converting the energy of a photon to eV: 1 eV = 1.6 × \(10^{-9}\) J Now let's calculate the energy of the incident photons: Energy of incident photons = (hc / λ) / (1.6 × \(10^{-9}\)

Substituting the given values: Energy of incident photons = (6.63 × \(10^{-9}\) J•s × 3 × \(10^{-9}\) m/s) / (295 × / (1.6 × \(10^{-9}\) Next, we can calculate the maximum kinetic energy of the photoelectrons: Maximum kinetic energy = Energy of incident photons - Work function

Substituting the work function (3.07 eV): Maximum kinetic energy = Energy of incident photons - 3.07 Now let's calculate the values: Energy of incident photons ≈ 2.11 eV

Maximum kinetic energy ≈ 2.11 eV - 3.07 eV Maximum kinetic energy ≈ -0.96 eV

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Answer: The surface temperature of Sirius B is 25,200 Kelvins(K).

Explanation: You would think Sirius would have a surface temperature of 9,940 Fahrenheit. That is somewhat correct, but Sirius is a binary star consisting of a main-sequence star of spectral type A0 or A1, termed Sirius A, and a faint white dwarf companion of spectral type DA2, termed Sirius B. Sirius, Sirius A, and Sirius B, are all different stars. Sirius A has a temperature of 9,940 Kelvins, but Sirius B has a temperature of 25,200 Kelvins(K).

That would be 9,940 kelvins (K)

Hope it helps! :D

Answer:d

Explanation:tsssss

At Compton angle, the electron receives the maximum amount of energy from the X-ray photon. Therefore, without performing any calculations, we can determine that the scattering angle corresponding to the Compton angle will provide the electron with the greatest energy.


The scattering angle that provides the electron with the greatest energy in Compton scattering can be determined without doing any calculations. According to Compton scattering, when an X-ray photon interacts with an electron, it transfers some of its energy and momentum to the electron. The energy transferred to the electron depends on the scattering angle.

In Compton scattering, the energy of the scattered photon decreases as the scattering angle increases. Conversely, the energy transferred to the electron increases as the scattering angle increases. At a specific scattering angle, known as the Compton angle, the energy transferred to the electron is maximized.

Since we are looking for the scattering angle that provides the electron with the greatest energy, we can conclude that the answer is the Compton angle. At this angle, the electron receives the maximum amount of energy from the X-ray photon. Therefore, without performing any calculations, we can determine that the scattering angle corresponding to the Compton angle will provide the electron with the greatest energy.


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A photon of light needs 100,000 years to travel across the Milky Way disk (assuming it isn't disturbed).

Our galaxy is around 100,000 light-years big and likely includes 100 to 400 billion stars. That sounds enormous, and it is—at least until we start putting it in the context of other galaxies. For instance, the Andromeda galaxy, which is next to us, is 220,000 light-years across.

The technology needed to travel between galaxies is much beyond what humanity is now capable of, and it is currently solely the stuff of science fiction. Theoretically speaking, however, there is nothing that demonstrates definitively that intergalactic travel is not feasible.

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Answer:

Multiple Solutions Below:

Explanation:

In the carrier of being a scientist, they often look at scientific data, then they use that data to make a hypothesis for their experiment.

Science is an interesting field that requires a long list of procedures to ensure that everyone is safe, and that it is done in an orderly fashion.

My friends hypothesize about the idea how the badger knows how to build a dam.

At a crime scene, a CSI investigates a substance on the ground, she finds a testable question and ponders to herself about what the substance is and goes to her lab.

In English class, things are not often in bold letters on what they mean, so we have to make an inference about the text to try and decipher what they mean.

Finally,

Science is one of four main subjects taught in school from fifth to twelfth grade, and beyond.

Hope this helps, and I hope it gives you multiple things to pick as the answer! Have a good day!

Due to atmospheric solar radiation absorption and scattering, the amount of radiation reaching the surface in a 1-layer atmosphere is enhanced by a factor of two.

Without an atmosphere, the amount of radiation reaching the surface is equal to the amount that the Sun emits. The single-layer atmosphere model accurately depicts the fundamental physical mechanisms causing atmospheric warming, however model-related numerical figures should be treated with caution. Note that there are two sources of the energy that is released into space. Energy balance models (EBMs) are remarkably simplified representations of the climate system that offer valid conceptual aids in comprehending climatic changes. The radiation budget, which accounts for both the Sun's incoming energy and its outgoing energy, determines the global temperature.

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Answer:second class lever needs less force to lift a load

Explanation: because the load is between the fulcrum/pivot point and the force. The fulcrum is far away from the force

Answer:

I would believe that it would be the last option

Explanation:

Physical science is a type of science that mainly focuses on natural objects that are not alive, such as minerals and rocks.

Answer:

THE STUDY OF MATTER AND ENERGY

Explanation:

Option (B) many

According to the lesson, it can be said that many adults have some of the same problems with sleep that Bailey does.

Sleeplessness is one of the most common issues, every second adult or a teenager is facing now a days. Due to a lot of responsibilities, we end up having little time for sleep and this in turn affects our body functions.

Good sleep hygiene is often recommended to improve sleep quality, which  also helps in alleviating anxiety due to work load and responsibilities.

Answer is Option (B) many

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The correct answer for  the kinetic coefficient of friction of the ramp  is 0.25.

First, we need to find the initial kinetic energy of the block. We can do this using the equation KE = (1/2)mv², where m is the mass of the block and v is its initial velocity. Plugging in the given values, we get:
KE = (1/2)M(16.97)² = 144.32M
Next, we need to find the work done by friction on the ramp. This can be found using the equation W = Fd, where F is the force of friction and d is the distance the block travels up the ramp. The force of friction can be found using the equation F = μN, where μ is the coefficient of friction and N is the normal force. The normal force on an inclined plane is equal to mgcosθ, where m is the mass of the block, g is the acceleration due to gravity, and θ is the angle of the incline. Plugging in the given values, we get:
F = μM(9.8)cos45° = 6.93μM

The distance the block travels up the ramp can be found using the Pythagorean theorem, since the ramp forms a right triangle with the horizontal and vertical distances. The horizontal distance is equal to the height of the ramp, which is given as 9.8 m. So we get:
d = √(9.8² + 9.8²) = 13.86 m
Now we can plug the values for F and d into the equation for work to get:
W = (6.93μM)(13.86) = 96.03μM
The work done by friction is equal to the change in kinetic energy, so we can set the two equations equal to each other and solve for μ:
144.32M - 96.03μM = 0
μ = 144.32/96.03 = 1.502
Finally, we can plug this value of μ into the equation for the coefficient of friction to get:
μ = F/N = (6.93μM)/(M(9.8)cos45°) = 0.25

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Answer:

4.4 m/s

Explanation:

KE = ½ mv²

810 J = ½ (82 kg) v²

v = 4.4 m/s

Answer:

4.4

Explanation:

got right on edg