Which statement is true about the loudness of a sound?

A.) it is directly proportional to the distance of the listener from the source.

B.) it is inversely proportional to the square of the distance of the listener from the source.

C.) it is directly proportional to the square of the distance between the listener from the source.

D.) it is inversely proportional to the distance between the listener from the source.

Answer:410.022779

Explanation: To figure out force, you use the equation F=MA. Well, in this case, you're trying to find M. The mass. All you have to do is rearrange. F=MA turns into A=F/M.

Answer:

0

Explanation:

the forces gets cancelled off. hence when applying F=Ma, F=0 therefore a=o

The acceleration of the cart is 0m/s². Option A is correct.

According to Newton's second law of motion:

\(\sum F=ma\)

m is the mass of the object

a is the acceleration

If a force of 25 newtons east and a force of 25  newtons, then the sum of force is expressed as:

\(\sum F = 25 - 25 =0N\)

Get the acceleration

\(a=\frac{\sum F}{m} \\a=\frac{0}{5} \\a=0m/s^2\)

Hence the acceleration of the cart is 0m/s²

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Answer:

1:2

Explanation:

There’s only 1 set of zinc chloride and there’s 2 sets of potassium chloride

As a star's temperature increases, it becomes hotter. Its color changes from orange, through yellow, to white.

When a constant force is applied, an increase in the mass of an object decreases its acceleration and vice versa.

The mass of an object is the quantity of matter present in the object.

Force is a push or pull agent that causes a change in the motion or state of rest of an object.

Acceleration of an object is the change in velocity with time of the object.

The relationship between the force, mass, and acceleration of an object is given below:

From the above formulas, it can be seen that mass and acceleration have an inverse relationship such that as one increases, the other decreases, and vice versa.

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Answer:

Explanation:

Hope this helps!

Answer:

a. constructive interference

Explanation:

100% correct

Answer:

34

ushshwywywhqkowkw

she

wjehgebqk

whwh

Answer:

34

Explanation:

24+10=34

Explanation:

time =4.5sec

gravity =9.8m/s square

so to determime the height we can use the formula

1/2 of gravity times time square

which results in 99.25

Please find attached photograph for your answer.

Hope it helps.

Do comment if you have any query.

Answer:

Approximately \(240\; {\rm Hz}\).

Explanation:

Consider how the motion of the boat (the source) affects the period of the sound wave as it appears to the observer.

The sound wave from this boat travels at the speed of sound \(v(\text{sound})\). At the same time, the boat (the source) is moving away from the observer at a speed of \(v(\text{boat})\). Let \(T_{s}\) denote the period of this wave, and let \(f_{s}\) denote the frequency.

The boat emits a wave crest after every interval of \(T_{s}\). During that time, the boat would have moved \(v(\text{boat})\, T_{s}\) further away from the observer. As a result, each subsequent crest would require an additional time of \(\Delta T\) to reach the observer:

\(\begin{aligned}\Delta T &= \frac{(\text{extra distance})}{(\text{wave speed})} = \frac{v(\text{boat})\, T_{s}}{v(\text{sound})}\end{aligned}\).

The source continues emitting crests with an interval of \(T_{s}\). However, because of the extra distance, it would appear to the observer that crests are arriving with an interval of:

\(\begin{aligned}T_{o} &= T_{s} + \Delta T \\ &=T_{s} + \frac{v(\text{boat})\, T_{s}}{v(\text{source})} \\ &= \left(1 + \frac{v(\text{boat})}{v(\text{source}}\right)\, T_{s}\end{aligned}\).

As it appears to the observer, the frequency of this wave would be:

\(\begin{aligned}f_{o} &= \frac{1}{T_{o}}\\ &= \frac{1}{\displaystyle \left(1 + \frac{v(\text{boat})}{v(\text{source}}\right)\, T_{s}} \\ &= \frac{f_{s}}{\displaystyle \left(1 + \frac{v(\text{boat})}{v(\text{source}}\right)} \\ &= \frac{250\; {\rm Hz}}{\displaystyle \left(1 + \frac{15\; {\rm m\cdot s^{-1}}}{342\; {\rm m\cdot s^{-1}}}\right)} \\ &\approx 240\; {\rm Hz}\end{aligned}\).

If you move a star twice as far away from Earth compared to where it is now, it will appear dimmer and smaller in size due to the inverse square law and angular size reduction.

To understand this, we need to consider two concepts: the inverse square law for brightness and the angular size reduction.

1. Inverse square law for brightness: This law states that the intensity of light (or brightness) decreases with the square of the distance from the source. When you move a star twice as far away from Earth, the brightness decreases by a factor of 2² or 4. This means the star will appear 1/4 as bright as it did before.

2. Angular size reduction: As the distance between the star and Earth increases, the star's angular size (the angle it subtends at the observer's eye) decreases, making it appear smaller. When the distance is doubled, the angular size is halved.

In conclusion, if a star is moved twice as far away from Earth compared to its current position, it will appear 1/4 as bright and half as large in angular size due to the inverse square law for brightness and angular size reduction.

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In ancient times, Astronomy was predicting the motion of the stars, while Astrology was predicting how those stars affected us.

 If a star is moving away, its light waves get stretched out to longer, redder, wavelengths, producing a redshift. The faster the star, the greater this shift, so observers can measure the line-of-sight speed from the Doppler shift.the astronomer William Herschel (1738-1822) systematically measured the proper motion of stars in the sky. He found that stars were moving apart in one region and coming closer together in another, and concluded that the Sun was moving toward the region where stars are moving apart.

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Answer:

Q₁ = 15.78 KJ

W = 5.76 KJ

Explanation:

First we find efficiency of this ideal Carnot engine:

Efficiency = 1 - T₂/T₁

T₁ = source temperature = 125°C + 273 = 398 K

T₂ = Sink Temperature = -20°C + 273 = 253 K

Therefore,

Efficiency = 1 - 253 K/398 K

Efficiency = 0.365 = 36.5%

Now, we find expelled heat (Q₂), by using latent heat of fusion of ice:

Q₂ = mH

where,

m = mass of ice melted = 30 g = 0.03 kg

H = Latent Heat of Fusion of Ice = 3.34 x 10⁵ J/kg

Therefore,

Q₂ = (0.03 kg)(3.34 x 10⁵ J/kg)

Q₂ = 1.002 x 10⁴ J = 10.02 KJ

Now, we use another formula of efficiency to find absorbed heat (Q₁):

Efficiency = 1 - Q₂/Q₁

0.365 = 1 - 10.02 KJ/Q₁

10.02 KJ/Q₁ = 1 - 0.365

Q₁ = 10.02 KJ/0.635

Q₁ = 15.78 KJ

Now, for work done we have the formula:

W = Q₁ - Q₂

W = 15.78 KJ - 10.02 KJ

W = 5.76 KJ

Answer:

getting shocked

Explanation:

i didnt really get the answer really much but i hope this helps

Answer:

Hair standing up

Explanation:

When there is a lot of static electricity, your hair stands up.

The element that is evident here is the importance of Christian practices. Option A

In the excerpt as we can see below, there is the depiction of the court life of the medieval era. In that era, there was quite a lot of tendency of the people to be very religious and the norms of the Christian faith was in the highest regard.

As such, in the medieval times, Christianity was a state religion in many cultures and its practices became an integral part of the national life of the people not only in England but across the world.

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Missing parts;

Read the excerpt from Sir Gawain and the Green Knight. When the King and his knights came into the hall, The chanting in the chapel had come to an end And a loud cry went up from the clerics and the others Proclaiming Noel once more, calling out the word again, And then the nobles ran and got the gifts ready . . . What element of medieval court culture is evident in the excerpt? the importance of Christian practices the acts of warfare over land rights the proper conduct of knights the subjects’ loyalty to their lords

Answer: a

Explanation: christian practices

(i) Switch k1 is closed:

The current passing through the circuit is:  0.25 amps

R_total = R1 + R2 = 3 + 5 = 8 ohms

The current passing through the circuit is:

i = V / R_total = 2 / 8 = 0.25 amps

(ii) Switches k1 and k2 are closed:

The current passing through the circuit is: 1.07 amps

1/R_total = 1/R1 + 1/(R2 + R3) = 1/3 + 1/(5 + 0) = 8/15

R_total = 15/8 ohms

The current passing through the circuit is:

i = V / R_total = 2 / (15/8) = 1.07 amps

(iii) Switch k1 is open and k2 is closed:

The current passing through the circuit is: 1.07 amps

1/R_total = 1/R2 + 1/(R1 + R3) = 1/5 + 1/(3 + 0) = 1/5 + 1/3 = 8/15

R_total = 15/8 ohms

The current passing through the circuit is:

i = V / R_total = 2 / (15/8) = 1.07 amps

So the current passing through the circuit depends on which switches are closed, and can range from 0.25 amps to 1.07 amps.

What is current?

Crrent refers to the flow of electric charge through a conductor, such as a wire. It is measured in amperes (A) and is defined as the rate at which electric charge flows past a given point in a circuit. current is caused by the movement of charged particles, such as electrons or ions, through a conductor.

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Travels in longitudinal waves

Travels most slowly through a gas

Speeds up when temperature is increased

Is caused by vibration

Explanation for correct answers:

Yes, it does travel in longitudinal waves

Yes, sounds weird, but travels faster in the water

Yes, does speed up when temperature is increased

And yes, Is caused by vibration.

Can travel through a vacuum

Explanation for wrong answer:

actually, in space, there is NO sound, because there are no particals for the sound to vibrate with, there's just empty SPACE.

A motion in one dimension is a type of motion that is always along a straight line and has a constant acceleration.

Motion refers to a change in the location (position) of an object or physical body with respect to a reference point, especially due to the action of an external force.

In Science, the motion of an object or physical body is described in terms of the following parameters:

Furthermore, there are three (3) forms of motion based on dimension and these include:

1. Motion in one dimension

2. Motion in two dimension

3. Motion in three dimension

A motion in one dimension (one-dimensional motion) is also referred to as rectilinear or linear motion. Also, it is always along a straight line in any direction and characterized by constant acceleration.

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Answer: Each time you switch to a higher power, the depth of focus is reduced. Therefore a smaller part of the specimen is in focus at higher power. The amount of light transmitted to your eye is greatest at the low power.

Explanation:

The answer is D. A more reactive metal replaces a less reactive metal in a chemical reaction.

Answer:

yes it does exert a force, it pushes it up

Explanation:

this is called normal force

if it didn't exert a force the book would keep going down

according to newton every force has an equal amd opposite reaction

so the book exerts a force on the table and vice versa

hope this helped

Explanation:

1 For a sound wave, the pitch is determined by which wave characteristic?

A - Frequency

2 Which of the following waves cannot be transmitted through a vacuum?

C - Sound waves

3 Which of the following could be the value of a wavelength that is found in the visible region of the electromagnetic spectrum?

B - 5 × 10^-7 m

4 Sophie is trying to measure the speed of sound. She stands 24.0 m away from a wall and claps repeatedly, changing the frequency until the echo synchronized with her claps. If she calculates the speed of sound as 325 m • s-1 how long did she wait between claps?

The time between her claps and the echo is twice the time it takes for the sound to travel from her to the wall. Therefore, the time between her claps is:

time = distance/speed = 2 x 24.0 m/325 m/s = 0.148 seconds (to three significant figures).

So the answer is 0.148, without units and correct to three significant figures

The SI unit of force is newton N.

What is force?

The definition of force is being explained by the Newtons Second law of Motion. This law states that the force is equal to the change in momentum per change in time. When we have to calculate the force for a constant mass, it is equal to the product of mass and acceleration i.e., F= ma

There are total seven fundamental units in physics.

Force = mass x acceleration

Force = kilogram x meter/ second 2

So, the unit of force derived from fundamental units are kg m/s2 and newton N is the unit in international system of units.

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Answer:

v = -\frac{n \ m}{M} \ v'

for the man to return to the ship he must throw the balls in the opposite direction of the ship

Explanation:

For this exercise we can use the conservation of momentum. Let's form a system made up of man and baseballs.

Initial instant. Before throwing the balls

     p₀ = 0

Final moment. After throwing the balls

     \(p_{f}\) = M v + n m v '

where M is the mass of the man, m is the mass of each ball and n is the number of balls , v isthe speed man and v' is the speed ball

Since the forces are internal, the momentum of the system is conserved

     p₀ = p_{f}

      0 = M v + n m v ’

      \(v =- \frac{n \ m}{M} \ v'\)

If we analyze this expression, for the man to return to the ship he must throw the balls in the opposite direction of the ship

Plugging these values into the formula, we get: angular acceleration = (1.7 m/s2) / (0.0021 m) = 809.52 rad/s2

The angular acceleration of the yo-yo is 809.52 rad/s2.

Hello! I'd be happy to help you with your question. To find the angular acceleration of the yo-yo, we'll need to use the following relationship: linear acceleration = radius × angular acceleration.

Given that the yo-yo has a center shaft radius of 0.21 cm (0.0021 m) and a linear acceleration of 1.7 m/s², we can rearrange the formula to find the angular acceleration:

angular acceleration = linear acceleration / radius

Angular acceleration = (1.7 m/s²) / (0.0021 m)

By calculating this, we get:

Angular acceleration ≈ 809.52 rad/s²

So, the angular acceleration of the yo-yo is approximately 809.52 rad/s².

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Answer:

   n = 1,429

Explanation:

In this exercise you are asked to calculate the refractive index, it is a constant that depends on the wavelength and relates the behavior of light when passing through two different material media.

The refractive index of a material is given by

         n = c / v

where n is the refractive index, c the speed of light and v the speed in the material medium

let's calculate

         n = 3.0 108 / 2.1 108

         n = 1,429

Temperature is increased the pressure also increases due to fast movement of molecules because of more energy.

The temperature of the gas is directly proportional to the pressure. Faster moving particles will collide with the walls of the container that put force on the wall which leads to increase in pressure.

So we can conclude that temperature is increased the pressure also increases due to fast movement of molecules because of more energy.

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The stationary soccer ball will begin moving downfield and the ball that struck it will slow down. Momentum of first ball is shared with ball in rest.

The meaning of MOMENTUM is a property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity. Momentum is a vector quantity.

Given in the question a soccer ball is travelling downfield with a force of 1.2 k.N and strikes another soccer ball that is stationary then there  is transfer of momentum between the  balls first ball will slow down and ball in rest will start moving.

The stationary soccer ball will begin moving downfield and the ball that struck it will slow down. Momentum of first ball is shared with ball in rest

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Answer:

(Question 1) Which statement best describes force?

(Answer) Force is a vector quantity that measures both direction and magnitude of a push or pull on an object.

(Question 2) A soccer ball is traveling downfield with a force of 1.2 kN and strikes another soccer ball that is stationary. Which of the following describes the result of the collision?

(Answer) The stationary soccer ball will begin moving downfield and the ball that struck it will slow down.

(Question 3) Which of the following scenarios accurately describes magnitude and direction?

(Answer) A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5 kN.

(Question 4) What is force directly proportional to?

(Answer) the acceleration and mass of an object

(Question 5) Two ropes are being used to suspend a box. Each rope is exerting 5 N of upward force. If the forces are balanced and the box is stationary, how much force is being exerted by the box itself and in which direction?

(Answer) The box exerts 10 N of force downward.

Explanation:

just finished the Quick Check, Enjoy UwU

Answer:

Electric charge. A fundamental property that leads to the electromagnetic interactions among particles that make up matter.