A wave has a speed of 30 m/s and a wavelength of 3 meters. Calculate its frequency.

Answer:

19.2J

Explanation:

For a string-mass system the elastic potential energy is given by:

[tex]U=\frac{1}{2}kx^2[/tex]

k: spring's constant = 240N/m

x: compression = 0.40m

by replacing the values of k and x you obtain:

[tex]U=\frac{1}{2}(240N/m)(0.40m)^2=19.2J[/tex]

hence, the elastic potential energy is 19.2J

Answer:

19.2j I took the assessment and got it right :)

Explanation:

Answer:

I think the answer is C

Explanation:

When you look at the table, two designs used a 9-volt battery, but the second design lifted more wait because the amount of wire they had wrapped around the magnetic core was more.

Group #2's electromagnet was stronger due to the use of a 9-volt battery, longer wire, and a double-nail core.

The strength of Group #2's electromagnet can be attributed to several aspects of their design:

By combining these aspects, Group #2 was able to create a stronger electromagnet compared to other groups.

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Answer:

Both A and B

Explanation:

Normally, the direct current through motor is controlled and directed by the control switches. Also, most of the available power windows and power locks in the market utilize the reversible permanent and in-built circuit breakers. Therefore, both technicians are correct.

Answer:

9 N

Explanation: Given that L = side of the cube = 10cm = 0.1m

Mass = Density * Volume

Let’s determine the volume of the cube in m^3.

V = L^3

V = 0.1^3 = 0.001m^3

Mass = 0.001 * 2.053 * 10^4 = 20.53kg

Weight = 20.53 * 9.8 = 201.194

Buoyant force = 201.194 – 192 = 9.194 N

This is approximately 9 N.

Given:

Length,

          = 0.1 m

Density,

Let,

The volume be in "[tex]m^3[/tex]"

then,

→ [tex]V = L^3[/tex]

       [tex]= 0.1^3[/tex]

       [tex]= 0.001 \ m^3[/tex]

Now,

→ [tex]Mass = Density\times Volume[/tex]

By putting the values,

             [tex]= 0.001\times 2.053\times 10^4[/tex]

             [tex]= 20.53 \ kg[/tex]

then,

Weight = [tex]20.53\times 9.8[/tex]

           = [tex]201.194[/tex]

hence,

The Buoyant force is:

= [tex]201.194-192[/tex]

= [tex]9.194 \ N[/tex]

Thus the above answer is correct.

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Answer:

Its natural frequency

Explanation:

Resonance occurs when a force causes an object to vibrate. The object has a higher probability of doing so at a specific rate called the object's natural frequency or resonant.

The frequency is dependent on the size, shape, and composition and properties of the object involved.

Answer:

Resonance occurs when a force causes an object to vibrate at

its own natural frequency

Explanation:

What is resonance .

This is a phenomenon in which an external force or a vibrating system forces another system around it to vibrate with greater amplitude at a specified frequency of operation.

When an object is forced to vibrate at its natural frequency, resonance occurs. Sound can travel through solids, liquids, gases, and even a vacuum. In order for sound from a speaker to reach a listener, air near the speaker must travel to the listener

What is a forced vibration?

Forced vibration is a type of vibration in which a force is repeatedly applied to a mechanical system.

Forced vibration is when an alternating force or motion is applied to a mechanical system.

Answer:

Electric power is the rate at which work is done or energy is transformed in an electrical circuit.

P = W/t

Explanation

Where  P is Power,

             W is work

             t = Time passed

The variation in solar output, or solar irradiance, can affect Earth's climate. Increased solar output can cause global warming, while decreased output can lead to cooling. These changes may interact with human-induced climate change, adding complexity to the climate scenario.

Recent research indicates that the variation in solar output can have significant impacts on Earth's climate. The sun's energy output, also known as solar irradiance, is not constant but changes in cycles. An increase in the sun's solar output can intensify Earth's weather patterns and temperatures, leading to global warming, while a decrease can lead to a period of cooling, which can be severe enough to cause an ice age as what happened during the Maunder Minimum in the 17th century. These are not immediate changes but play out over many generations.

In terms of Earth's climate, the variation in solar output may at times overlap or interact with the effects of human-induced climate change, complicating the overall picture. Therefore, it is crucial to understand both natural and human-induced factors influencing our planet's climate.

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Answer:

check image

Explanation:

For any question related to newons law of motion first draw the free body diagram(FBD),

Answer:

travels in waves through space

Explanation:

A cosmic microwave background radiation is classified as a form of electromagnetic energy because it

travels in waves through space

The cosmic microwave background is assumed to be a left over radiation  from the Big Bang, or the time  when the universe began. This means its radiationis most visible in the microwave part of the electromagnetic spectrum.

Answer:

The answer is:

Because it travels in waves through space.

Explanation:

CMB is a form of radiation discovered in 1965 that is presented as one of the main tests of the cosmic model since it is a type of radiation that fills the entire universe.

It has the characteristics of black-body radiation (a theoretical or ideal object that absorbs all light and all radiant energy incident on it) at a temperature of 2,725 K, with a frequency of 160.2 GHz and a length of 1.9mm wave belonging to the microwave. rank

a) Constant

b) Constant

Explanation:

a)

We can answer this question by using the equivalent of Newton's second law of motion of rotational motion, which can be written as:

[tex]\tau_{net} = I \alpha[/tex] (1)

where

[tex]\tau_{net}[/tex] is the net torque acting on the object in rotation

I is the moment of inertia of the object

[tex]\alpha[/tex] is the angular acceleration

The angular acceleration is the rate of change of the angular velocity, so it can be written as

[tex]\alpha = \frac{\Delta \omega}{\Delta t}[/tex]

where

[tex]\Delta \omega[/tex] is the change in angular velocity

[tex]\Delta t[/tex] is the time interval

So we can rewrite eq.(1) as

[tex]\tau_{net}=I\frac{\Delta \omega}{\Delta t}[/tex]

In this problem, we are told that at a given instant, the object has an angular acceleration due to the presence of torques, so there is a non-zero change in angular velocity.

Then, additional torques are applied, so that the net torque suddenly equal to zero, so:

[tex]\tau_{net}=0[/tex]

From the previous equation, this implies that

[tex]\Delta \omega =0[/tex]

Which means that the angular velocity at that instant does not change anymore.

b)

In this second case instead, all the torques are suddenly removed.

This also means that the net torque becomes zero as well:

[tex]\tau_{net}=0[/tex]

Therefore, this means that

[tex]\Delta \omega =0[/tex]

So also in this case, there is no change in angular velocity: this means that the angular velocity of the object will remain constant.

So cases (a) and (b) are basically the same situation, as the net torque is zero in both cases, so the object acts in the same way.

Answer:

speed, direction, or both

Explanation:

If forces acting on an object are unbalanced, the object could experience a change in speed, direction, or both.

When the forces operating on an item are imbalanced, it signifies that the object's net force is not zero.

This causes the item to accelerate in the direction of the net force. As a result, depending on the direction of the net force, the object's speed may change, causing it to either accelerate or decelerate.

Due to the uneven forces, the item may potentially change its direction of travel.

The magnitude and direction of the unbalanced forces acting on the item will determine the degree of the changes in speed and direction.

Thus, unbalanced forces can thus induce a range of changes, including changes in speed, direction, or both.

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Answer:

[tex]27.164 lb/in^2[/tex]

Explanation:

We are given that

Gauge pressure at 3.4 degree Celsius,P=[tex]24lb/in^2[/tex]

We have to find the gauge pressure in tire when the temperature rises to 26 degree Celsius.

Atmospheric pressure=[tex]14.7lb/in^2[/tex]

[tex]P_1=P+14.7=24+14.7=38.7lb/in^2[/tex]

K=273+Degree Celsius

[tex]T_1=3.4+273=276.4 K[/tex]

[tex]T_2=26+273=299K[/tex]

[tex]P_2=\frac{P_1T_2}{T_1}[/tex]

[tex]P_2=\frac{38.7\times 299}{276.4}[/tex]

[tex]P_2=41.864 lb/in^2[/tex]

Gauge pressure in tire when the temperature rises to 26 degree Celsius.=[tex]41.864-14.7=27.164lb/in^2[/tex]

Answer:

27.16 lb/in²

Explanation:

initial temperature, T1 = 3.4 °C = 276.4 K

initial gauge pressure, P1 = 24 lb/in²

atmospheric pressure, Po = 14.7 lb/in²

initial absolute pressure, P1' = Po + P1 = 14.7 + 24 = 38.7 lb/in²

final temperature, T2 = 26 °C = 299 K

Let the final gauge pressure is P2.

use the ideal gas equation and the volume is constant.

[tex]\frac{P_{1}'}{T_{1}}=\frac{P_{2}'}{T_{2}}[/tex]

[tex]\frac{38.7}{276.4}=\frac{P_{2}'}{299}[/tex]

P2' = 41.86 lb/in²

Now the gauge pressure, P2 = P2' - Po = 41.86 - 14.7 = 27.16 lb/in²

Thus, the new gauge pressure is 27.16 lb/in².

Answer:it the tendon

Explanation:

Answer: The answer would be bone... I mean organ

Explanation:

Look in the defenition In edunuity

Answer:

The length of the antenna would be L = 1056 km

Explanation:

Given:-

- The frequency of ELF, f = 71 Hz

- The speed of EM wave, c = 3.00 *10^8 m/s

Find:-

Calculate the length of a quarter-wavelength antenna for a transmitter generating ELF waves

Solution:-

- We will first determine the wavelength (λ) of the ELF waves with frequency (f) generated by the transmitter. The relationship that holds true for all types of EM waves is:

                            λ = c / f

                            λ = (3.00*10^8 m/s) / ( 71 Hz )

                            λ = 4225352.11267 m

- The antenna of the transmitter is to be designed such that its length (L) is 1/4-wavelength of ELF generated. So:

                            L = 0.25*λ

                            L = 0.25*4225352.11267

                            L = 1056 km          

Answer:

its the 3rd one with the hand and the beam on light shining through it

Explanation:

Answer:

3rd choice

Explanation:

glass of water is refraction

cat/mirror is reflection

an example of diffraction is if you have a screen w/ a slit in it and you shined a light on one side of it, so based on that, I would go with the 3rd choice with the hand and the light coming through between the fingers

Answer:

The noun agony means acute pain — either mental or physical, but people often use the word hyperbolically: "This paper cut is agony." The noun agony is also used in the common phrase "the thrill of victory and the agony of defeat," which has been the tag-line of ABC's Wide World of Sports for decades.

Explanation:

Answer:

purchasing bonds in order to increase the money supply.

Explanation:

The Federal Reserve raises or lowers interest rates through its regularly scheduled Federal Open Market Committee. That's the monetary policy arm of the Federal Reserve Banking System.

The Fed can attempt to increase the federal funds rate by selling Treasury​ bills, which decreases bank reserves.

Answer:

The charged particle follows a spiral path in a magnetic field.

Explanation:

A charge immersed in a region with an electric field experiences a force that acts along the same direction of the electric field. In particular:

- The force has the same  direction as the electric field if the charge is positive

- The force has the opposite direction as the electric field if the charge is negative

Therefore, a charge moving in an electric field is accelerated along the direction of the electric field.

On the other hand, a charge in motion in a region with a magnetic field experiences a force that acts perpendicular to the direction of the field. This means that a charge in motion in a magnetic field will acquire a circular motion in the plane perpendicular to the direction of the magnetic field.

As a result, if the particle has also a original motion outside this plane, its final motion will consist of:

- A uniform motion along that direction, +

- A circular motion along the plane perpendicular to the field

So, the resultant motion of the particle will be a spiral path. So the correct answer is

The charged particle follows a spiral path in a magnetic field.

Final answer:

The motion of charged particles differs significantly in electric versus magnetic fields. In magnetic fields, particles exhibit circular or spiral motions, and in electric fields, the motion is linear. This difference allows for the clear distinction between the two types of fields based on the particle's path.

Explanation:

The motion of a charged particle can be a revealing indicator of the presence and type of field it is moving through. When examining the behavior of charged particles, we see distinct patterns emerge in magnetic and electric fields. For magnetic fields, the motion is characterized by circular or spiral paths due to the magnetic force acting perpendicular to the particle's velocity. This is starkly different in an electric field, where the charged particle tends to move in a linear path along the direction of the field.

Magnetic fields cause a charged particle to follow a circular or helical path, with the nature of this motion being dependent on the angle between the velocity of the particle and the magnetic field lines. Technologies such as cyclotrons and mass spectrometers exploit this principle, utilizing magnetic fields to guide charged particles along desired paths.

In contrast, in an electric field, charged particles move linearly, aligning with the electric field lines. This linear motion is a result of the electric force acting along the direction of the field, guiding the particles in a straightforward path. The distinction between these two types of motion provides a clear method for distinguishing between magnetic and electric fields based on the observed path of a charged particle.

Answer:

varn=n1+1ehvkT–1

Explanation:

This is Einstein's equation.

Answer:

Explanation:

Acceleration =  a change in velocity / a change in time

Acceleration = ( final velocity - initial velocity) / a change in time

Acceleration = (6m/s - 35 m/s ) / 5 s

                     = (-29 m/s) /( 5 s)

                     = - 5.8 m/s^^2  

Remember Significant Figures  

- 6 m/s^2

P.S I have no idea why the answers say m/s because acceleration is m/s^2.

:)

Answer:

According to me, v=w×f is the correct formula...

Explanation:

v=w×f :-

The velocity of a wave can be found by multiplying the wavelength of the wave by its frequency.

The velocity of a wave can be found by multiplying the wavelength of the wave by its frequency. The formula for wave speed is v = λf, where v is the velocity, λ is the wavelength, and f is the frequency. For example, if the wavelength of a wave is 2 meters and its frequency is 5 Hz, the velocity of the wave would be 10 m/s. It's important to note that the velocity of a wave is determined by the medium through which it is traveling and not by the amplitude of the wave.

Answer:

400k

Explanation:

Answer:

Reflection

Explanation:

The wave phenomenon that allows the DVD player to work is REFLECTION.

Reflection is defined as the repropagation of incident light striking a plane surface.

The light ray striking the surface is incident ray while the repropagated light ray is the reflected ray. The DVD was able to play because the laser light that hits the surface of the disk was able to reflect back and returns to the detector. The detector senses the light and cause the DVD to play. If the laser light didn't reflect, assuming it was absorbed by the surface of the disk, the detector wouldn't have detected the light and the DVD wouldn't have played.

Answer:

C. Reflection

Explanation:

Edge 2020

Answer:

C. are often metals

and

D. have high conductivity

Answer:

radial artery and carotid artery

Explanation:

Answer:

F = 0.332 N in the east direction

Explanation:

Length, L = 7.7 cm = 7.7 * 0.01 = 0.077 m(along the north south)

Current, I = 3.45 A (northwards)

Magnetic field, B = 1.25 T (vertically upwards)

The magnitude of the force is given by, F = ILBsin90

F = 3.45 * 0.077 * 1.25 * 1

F = 0.332 N

The direction of the force is calculated using the Right Hand Thumb Rule:

It states that "Hold the wire carrying current in your right hand so that the thumb points along the wire in the direction of the current, then the fingers will encircle the wire in the direction of the lines of magnetic force."

Based on the Right Hand Thumb Rule, the magnetic force will act in the east direction

Final answer:

Electrical conductivity is a property indicating how easily electricity can flow through a material, with conductors having high conductivity and insulators having low. Resistance measures how much a material opposes the flow of charge, dependent on the material's resistivity and affected by temperature. Dielectric strength is the maximum electric field an insulator can withstand before conducting.

Explanation:

The measure of an object's ability to transmit electricity is known as its electrical conductivity. Electrical conductivity is a property of materials that indicates how easily electric current can flow through them. Conductors, like copper, gold, and silver, exhibit high electrical conductivity, whereas insulators have much lower electrical conductivity. Electrical conductivity is quantified by the relationship σ = J/E, where σ is the conductivity, J is the current density, and E is the electric field strength. Materials with high conductivity have low resistance, while materials with low conductivity have high resistance. The resistance of a material is influenced by its inherent resistivity and is also affected by factors like temperature.

Resistance is a concept that describes how much a material opposes the flow of electric charge. Highly resistant materials make it difficult for electric current to pass through, necessitating a higher energy (voltage) to drive the current. Additionally, the resistivity of a material is a fundamental property that dictates the resistance of an object made from that material. Superconductors are exceptional in that they have zero resistance at very low temperatures, meaning they can conduct electricity without energy loss.

Another related concept is dielectric strength, which pertains to insulating materials. It is defined as the maximum electric field strength that an insulating material can withstand before it begins to break down and conduct electricity, signifying a loss of its insulating properties.

Answer:

Explanation:

Givent that,

The required force to pull the peddle is

F = 14N,

The peddle has a mass of

m = 0.08kg

To a distance of 0.1m

d = 0.1m

Using conservation of energy

The workdone by pulling the peddle to a certain distance is equal to the kinectic energy of the peddle

Work done = K.E

F × d = ½ mv²

14 × 0.1 = ½ × 0.08 × v²

1.4 = 0.04 v²

v² = 1.4 / 0.04

v² = 35

v = √35

v = 5.92 m/s

The velocity of the peddle is 5.92 m/s

Given that,

Mass of object, m = 55 kg

Mechanical energy of the object, M = 4306 J    

Potential energy, P = 2940 J

We know that the mechanical energy is the sum of kinetic and potential energy such that,

Mechanical energy = kinetic energy + potential energy

[tex]K=M-P\\\\K=4306-2940\\\\K=1366\ J[/tex]

Kinetic energy is given by :

[tex]K=\dfrac{1}{2}mv^2[/tex]v is velocity of object

[tex]v=\sqrt{\dfrac{2K}{m}} \\\\v=\sqrt{\dfrac{2\times 1366}{55}} \\\\v=7.04\ m/s[/tex]

So, the velocity of object is 7.04 m/s.            

Answer:

D. slow evolution

Explanation:

The bars in barred spiral galaxies are formed through ; ( D ) slow evolution

Barred spiral galaxies are galaxies which appear with its center having a bar-shaped structure which is populated with stars, and this is found/commonly seen in about 50% of spiral galaxies.

The bar shaped center helps with the regulation of the movement of stars, dust and gas in the spiral galaxies.The bars are formed as the spiral galaxies continue to evolve slowly overtime.

Hence we can conclude that The bars in barred spiral galaxies are formed through slow evolution.

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