helpppp please I'm really stuck on this question

The frequency of the sound wave is 1.07 × 10⁹ Hertz

Wavelength is simply the distance over which the shapes of waves are repeated.

From the wavelength, frequency and speed relation,

λ = v ÷ f

Where λ is wavelength, v is velocity/speed and f is frequency.

Given that:

Plug values into the above formula.

λ = v ÷ f

f = v / λ

f = ( 343 m/s ) / ( 3.2 × 10⁻⁷ m )

f = 1.07 × 10⁹ Hz

Therefore, the frequency is 1.07 × 10⁹ Hz.

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Answer:

Displacement = 1725m

Explanation:

\(t = \frac{u-v}{a}\)

\(t = \frac{65-50}{0.5} = 30s\)

\(s = ut+\frac{1}{2}at^{2} \\s = 50*30 + \frac{1}{2} *0.5*30^{2} = 1725m\)

Fraction of the light shining straight at a piece of clear glass is reflected from the first surface is 1/8.

Light is a form of energy that enables us to see the world around us. It is an electromagnetic radiation that is visible to the human eye. Light can be measured in various units such as lumens, lux, and candelas. Light waves are of different colors, and each color has a different wavelength.The reflection of light from a surface is called reflection. When light falls on a surface, it may be absorbed, transmitted, or reflected. Reflection of light is the property of a surface to reflect light. The reflection of light from a smooth surface is called specular reflection, and the reflection from an irregular surface is called diffuse reflection.Reflection of lightWhen a beam of light is reflected from a surface, the angle of incidence and the angle of reflection are equal. The angle of incidence is the angle between the incoming ray and the normal to the surface at the point of incidence. The angle of reflection is the angle between the reflected ray and the normal to the surface at the point of incidence.

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The tension in the connecting string, if F = 8.0 N and M = 1.0 kg, the pulley and all surfaces are frictionless is 4.1 N. The correct option is 1.

In this problem, we have a mass (M) of 1.0 kg and a force (F) of 8.0 N acting on a frictionless pulley system. The goal is to determine the tension in the connecting string. To solve this problem, we need to consider Newton's Second Law of Motion, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma).

First, we need to find the acceleration (a) of the system. Since the pulley is frictionless, the only force acting on the mass is the force F. Therefore, the net force acting on the system is F = 8.0 N. Using Newton's Second Law, we can determine the acceleration:

F = ma
8.0 N = (1.0 kg) × a

Solving for a, we get:

a = 8.0 N / 1.0 kg = 8.0 m/s²

Now that we have the acceleration, we can find the tension (T) in the connecting string. In a frictionless pulley system, the tension in the string is equal to the force exerted by the mass as it accelerates:

T = m × a
T = (1.0 kg) × (8.0 m/s²)

Calculating T, we get:

T = 8.0 N

However, due to the pulley system, the tension is divided equally between the two parts of the string, so the tension in the connecting string is:

T = 8.0 N / 2 = 4.0 N

The closest answer to 4.0 N is 4.1 N, so the correct answer is option 1) 4.1 N.

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Answer:

True

True

Explanation:

Answer:

Number of Significant Figures: 3

The Significant Figures are 2 3 5

Explanation:

The height above the surface of Planet P where the gravitational acceleration is 58.8 percent of its value at the surface is 3890 km.

Option C

The gravitational acceleration at a height h above the surface of Planet P is given by:

g(h) = g(0) x (R / (R + h))^2

where;

We are given that:

g(h) = 0.588 x  g(0)

R = 9250 km

Substituting these values into the equation above, we get:

0.588  x g(0) = g(0) x (9250 / (9250 + h))^2

Simplifying and solving for h, we get:

h = 3890 km

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Answer:

625000 J

Explanation:

KE = mv^2/2

= (2000kg*(25m/s^2))/2

= 625000 J

The appropriate thermocouple probe to use for checking the internal temperature of a beef roast is C. Penetration probe.

This type of probe is specifically designed for measuring the internal temperatures of solid or semi-solid materials, like meats. A penetration probe features a sharp, pointed tip that can easily pierce through the beef roast, allowing for an accurate measurement of the temperature inside. This ensures that the roast is cooked to the desired level of doneness and is safe for consumption. Other probe types, such as air, immersion, or surface probes, are not suitable for this application, as they are designed for measuring temperatures in different environments, like gases, liquids, or on surfaces, respectively.

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When an airplane travels 640 miles from Topeka to Houston in 3. 2 hours, going against the wind. The return trip is with the wind and takes only 2 hours. Then the rate of the airplane with no wind is 260 miles/hr, and the rate of the wind is 100 miles/hr

Let Va is the velocity of the airplane

Va is the velocity of the wind

When flying against the wind then

(Va+Vw)*(3.2 hours) = 640

3.2Va + 3.2Vw = 640

3.2Vw = 640 - 3.2Va

Vw = 200 - Va----------------(1)

When flying with the wind:

(Va-V)*(2 hours) = 640km

2Va - 2Vw = 640

Va - Vw = 320 ----------------(2)

Putting the value of VW in equation (2) we get

Va - (200-Va) = 320

2Va = 320 +200

2Va = 520

Va = 260

Putting this value in equation (2)

Vw =Va - 360

Vw = 100

Therefore the rate of the airplane with no wind is 260 miles/hr, and the rate of the wind is 100 miles/hr

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Answer:

1000meters

Explanation:

Let the wavelength of the radio wave be W and it's frequency be f. If the wavelength of a radio wave varies inversely as its frequency, then W∝1/f

W = k/f where k is the constant of proportionality.

k = Wf

If a wave with a frequency of 1800 kilohertz has a length of 200 meters, then k = 1800×200

k = 360,000kHzm

To get the length of a wave with a frequency of 360 kilohertz, we will substitute the value of k and f = 360kHz into the initial formula i.e

W = k/f

W = 360,000/360

W = 1000meters

Hence the length of a wave with a frequency of 360 kilohertz is 1000meters

Athletes are asked to immediately squat to a depth of their choosing and then jump as high as they can in the Countermovement Jump (CMJ), a vertical jump test.

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The period of the pendulum is 1.6 seconds. The period of a pendulum is the time it takes to complete one full oscillation or one cycle. Therefore, to find the period of a pendulum, we use the formula; T = (t/n)

Here; T is the period of the pendulum, t is the total time of oscillation (in seconds)and n is the number of oscillations or cycles.

Suppose you built a pendulum and set it swinging. You measure 15 cycles of the pendulum and get a time of 24.00 s.

We use the formula above to calculate the period of the pendulum;

T = (t/n)T

= (24.00 s/15)T

= 1.6 s

Therefore, the period of the pendulum is 1.6 seconds.

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Answer: An atom's emission of light with a specific amount of energy confirms that atoms must have a dense central mass surrounded by electrons at a distance

plz mark brainliest

Answer:

It's B, electrons emit and absorb energy based on their position around the nucleus.

False.

An electric field vector, denoted as E⃗, points in the direction of the electric field at a given point. If the electric field points away from you, it means that the vector is directed outward from your position.

If the magnitude of the electric field is increasing, it means that the strength of the field at that point is increasing. This can be visualized as the field lines becoming more closely spaced or the density of field lines increasing.

In summary, if the electric field E⃗ points away from you and its magnitude is increasing, the statement is true.

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As you move deeper into the Earth, both density and temperature increase. This is due to the pressure of the layers above compressing the materials beneath them, causing the atoms and molecules to become more tightly packed together.

Density refers to the amount of mass in a given volume, so as more material is compressed into a smaller space, the density increases.

The temperature increase is caused by several factors. The first is the heat left over from the formation of the Earth, which has not yet completely dissipated. Additionally, the radioactive decay of certain elements within the Earth's core releases heat, which also contributes to the rising temperature. Finally, the pressure of the layers above causes the temperature to increase through adiabatic heating, a process in which gas is compressed and heats up as a result.

Overall, as you move deeper into the Earth, density and temperature both increase due to the pressure and heat generated by the layers above. By understanding these changes, scientists can gain valuable insight into the composition and behavior of our planet's interior.

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Answer:

-2m/s^2

Explanation:

final velocity = 20m/s

initial velocity = 50 m/s

time taken = 60 s

20-50=30m/s

30/60 = -2

Transport externalities, such as congestion, emissions, crashes, and noise, have impacts that extend beyond the immediate users. Mitigating these externalities involves aligning private costs with social costs through measures like taxes or regulations.

Transport externalities can be valued using techniques like direct costing, hedonic pricing, contingent valuation, or control costs. Externalities can occur due to both insufficient and excessive capacity, and they affect third parties beyond the primary parties involved in transportation activities.

a. Correct. Examples of transport externalities include congestion, emissions, crashes, and noise. These are negative impacts that extend beyond the direct users of transportation systems.

b. Partially correct. Mitigating transport externalities often involves internalizing the costs by making private costs align with social costs. This can be achieved through measures such as taxes, fees, or regulations that increase the private costs associated with the negative externalities.

c. Partially correct. Transport externalities can indeed be valued using direct costing or hedonic pricing techniques. These methods aim to estimate the monetary value of externalities by assessing factors such as property values, health costs, or time lost due to congestion.

d. Incorrect. Transport externalities can occur in various situations, including both when too little or too much capacity is provided. For example, congestion can result from inadequate capacity, while environmental impacts can arise from excessive capacity or vehicle usage.

e. Incorrect. Transport externalities can be valued using contingent valuation or control costs techniques, among others. Contingent valuation involves surveying individuals to elicit their willingness to pay or accept compensation for specific externalities. Control costs techniques assess the costs associated with implementing measures to control or mitigate the externalities.

f. Incorrect. Externalities by definition impact third parties, beyond the immediate users or providers involved. Externalities refer to the costs or benefits that affect individuals or entities not directly involved in a transaction or activity. These impacts can be positive or negative, but they extend beyond the primary parties involved.

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The relationship between the length of a resonance tube and the pitch of the note it plays is that a longer tube produces a lower pitch, while a shorter tube produces a higher pitch. This is due to the way the frequency of sound waves changes with the length of the tube.

To explain further, the frequency of a sound wave is related to its wavelength and the speed of sound. When you sound a variety of resonance tubes, each tube resonates at a specific frequency, which is determined by the length of the tube. As the tube length increases, the wavelength of the sound wave increases, resulting in a lower frequency and hence, a lower pitch. Conversely, when the tube length decreases, the wavelength decreases, leading to a higher frequency and a higher pitch.

This phenomenon can be observed in musical instruments like the organ or the flute, where longer tubes produce deeper, lower-pitched sounds, and shorter tubes produce higher-pitched sounds. It is important to note that other factors, such as the material of the tube and the method of sound production, can also affect the pitch and tone of the note. However, the general relationship between tube length and pitch remains consistent across various types of resonance tubes.

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Answer:

Electrical energy

Explanation:

The time taken to increase the speed of the train from rest to 78.0 km/h is 6.8 mins

We'll begin by obtaining the impulse of the sytem. This is shown below:

Impulse = final momentum – Initial momentum

Impule = m(v - u)

Impulse = 1.30×10⁷ × (21.67 - 0)

Impulse = 1.30×10⁷ × 21.67

Impulse = 281710000 Ns

Finally, we shall determine the time taken. This is shown below:

Impulse = force × time

281710000 = 6.90×10⁵ × time

Divide both sides by 6.90×10⁵

Average force = 281710000 / 6.90×10⁵

Time = 408.28 s

Divide by 60 to excess in minutes

Time = 408.28 / 60

Time = 6.8 mins

Thus, we can conclude that the time taken is 6.8 mins

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6  joule is work  done when the object moves from 0 m to 2 m

F=3N

d=2m

work done=Fd

work done=2×3

work done=6 joule

When moving an object over a distance, an external force must direct at least a portion of its force in the direction of the displacement. This is referred to as work done in physics. If the force acting along the path is constant, the amount of work can be calculated by multiplying the length of the path by the force's component. The work W is equal to the force f times the distance h to express this idea mathematically, or W = mgh. The work is W = mas if the force is applied at an angle to the displacement.

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Answer:

Electricity is measured in units of power called Watts,

hope this helps

have a good day :)

Explanation:

a) To find the center of mass, we first need to find the total mass of the system. Adding the masses of the two sprinters, we get 120.8 kg. Let x be the distance from the starting point to the center of mass. We can set up an equation using the fact that the total momentum of the system is conserved:
55 kg * 4.3 m/s + 65.8 kg * 2.7 m/s = 120.8 kg * x * V
where V is the velocity of the center of mass. Solving for x, we get x = 1.67 m.
Since the first sprinter is ahead of the second by 4.1 m, the center of mass is located 4.1 m - 1.67 m = 2.43 m ahead of the second sprinter.
b) The velocity of the center of mass can be found by taking the weighted average of the velocities of the two sprinters:
V = (55 kg * 4.3 m/s + 65.8 kg * 2.7 m/s) / 120.8 kg = 3.55 m/s
So the center of mass is moving at a speed of 3.55 m/s.
c) The momentum of the center of mass is simply the mass of the system times its velocity:
P = 120.8 kg * 3.55 m/s = 429.64 kg m/s
d) The momentum of the center of mass and the total momentum of the sprinters are equal, so the answer is b.

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Answer:

420000N

Explanation:

Given parameters:

Mass of the train  = 5.6 x 10⁵kg

Acceleration  = 0.75m/s²

Unknown:

Resultant force = ?

Solution:

According to newton's second law, force is the product of mass and acceleration;

   Force  = mass x acceleration

Resultant force that acts on the train is given below;

 Force  = 5.6 x 10⁵kg  x 0.75m/s²  = 420000N

The absorbance of light is 550 nm, then the energy gap in the orbital will be equal to 2.3 eV.

The capacity to perform work is known as energy in physics. Potential, kinematic, thermodynamic, electromagnetic, chemical, nuclear, and other types are all possible.

As energy is transferred through one body to another, there is also heat and work. As a result, heat transfer may result in thermal energy, whereas labor done may result in mechanical power.

As per the data provided in the question,

Use the equation for energy gap,

λ = 550 nm

EG = hc/λ

EG = 1240/550

EG = 2.3 eV.

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Answer:

D  

Explanation:

The devices used to change speed, torque, and direction of travel are known as transmission.

Transmission is a machine that controls the application of power from the engine to the driveshaft. Transmission changes the speed, torque, and direction of travel of a vehicle or machine.

A transmission is a device that is used to control the power produced by the engine. The transmission system directs power from the engine to the wheels, enabling them to spin at the appropriate speed and torque.

The transmission changes the speed and torque ratio from the engine to the wheels, allowing the vehicle to travel at different speeds and move in different directions.

There are several types of transmission, including manual, automatic, continuously variable, and dual-clutch. Each type has its own set of characteristics and is suited for a particular type of vehicle and driving style.

Manual transmission, also known as stick-shift, requires the driver to manually shift the gears. It provides the driver with more control over the vehicle and is frequently used in sports cars and high-performance vehicles. It is also more fuel-efficient and cheaper to repair than an automatic transmission.

Automatic transmission is the most common type of transmission used in vehicles today. It does not require the driver to manually shift the gears and is easier to use. It provides a smooth and comfortable driving experience but is less fuel-efficient and more expensive to repair than a manual transmission.

Continuously variable transmission (CVT) is a type of automatic transmission that does not have fixed gears. It provides a smooth and seamless driving experience and is more fuel-efficient than an automatic transmission. It is commonly used in hybrid vehicles and small cars.

Dual-clutch transmission (DCT) is a type of automatic transmission that uses two clutches to switch between gears. It provides faster gear changes than a manual transmission and is commonly used in sports cars and high-performance vehicles.

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Answer:

7572 m/s

Explanation:

The force between two masses separated by a distance r is given as:

\(F=G\frac{m_1m_2}{r^2}\)

Where F is the attractive force between 2 masses, m1 and m2, r is the distance between the centres of the masses and G is the universal gravitation constant, which is \(6.674*10^-11 Nm^2/kg^2\)

The mass of the earth (\(m_1\)) is far greater than the mass of the sputnik (\(m_2\)). Therefore \(m_1m_2=m_1\). The mass of the sputnik is neglected, therefore:

\(F=G\frac{m_1}{r^2}=\frac{(6.674*10^{-11})(5.98*10^{24})}{(6.96*10^6)^2} = 8.2389N\)

But F is actually centripetal acceleration, a = v²/r

\(8.2389 = v^2 / 6.96*10^6\\v=7572m/s\)