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Marrrta [24]
3 years ago
10

20 points!

Physics
2 answers:
fgiga [73]3 years ago
5 0

The pitch of a sound is determined by its frequency and its effect on the wave. This is known as the Doppler Effect. The pitch of a sound is related to the frequency of the sound wave.

I had this assignment and got a great score, good luck! Also I love your profile picture, Magnus Bane, right?

Flauer [41]3 years ago
3 0

<u>The frequency of the sound</u> determines the pitch .The higher the frequency , the more high pitched it will sound. if the frequency is very low, it will sound very low pitched.

           This is affected by motion of a sound source because if the sound source moves faster, this makes the frequency higher( since frequency is the number of waves/revolutions/whatever per second)

So , if for example , the sound source makes 4 vibrations or whatever in  a second , it will have a frequency of 4Hz ,   but if a sound source makes 8 vibrations or whatever in a   second , it will have a frequency of 8Hz . And since pitch is determined by frequency , the sound pitch with a frequency of  8Hz will have a higher pitch than sound source with a frequency of 4Hz.

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A bicyclist is finishing his repair of a flat tire when a friend rides by with a constant speed of 3.6 m/s . Two seconds later t
dybincka [34]

Answer:

A) t = 7.0 s    

B) x = 25 m  

C) v = 10 m/s

Explanation:

The equations for the position and velocity of an object traveling in a straight line is given by the following expressions:

x = x0 + v0 · t + 1/2 · a · t²

v = v0 + a · t

Where:

x = position at time t

x0 = initial position

v0 = initial velocity

t = time

a = acceleration

v = velocity at time t

A)When both friends meet, their position is the same:

x bicyclist = x friend

x0 + v0 · t + 1/2 · a · t² = x0 + v · t

If we place the center of the frame of reference at the point when the bicyclist starts following his friend, the initial position of the bicyclist will be 0, and the initial position of the friend will be his position after 2 s:

Position of the friend after 2 s:

x = v · t

x = 3.6 m/s · 2 s = 7.2 m

Then:

1/2 · a · t² = x0 + v · t       v0 of the bicyclist is 0 because he starts from rest.

1/2 · 2.0 m/s² · t² = 7.2 m + 3.6 m/s · t

1  m/s² · t² - 3.6 m/s · t - 7.2 m = 0

Solving the quadratic equation:

t = 5.0 s

It takes the bicyclist (5.0 s + 2.0 s) 7.0 s to catch his friend after he passes him.

B) Using the equation for the position, we can calculate the traveled distance. We can use the equation for the position of the friend, who traveled over 7.0 s.

x = v · t

x = 3.6 m/s · 7.0 s = 25 m

(we would have obtained the same result if we would have used the equation for the position of the bicyclist)

C) Using the equation of velocity:

v = a · t

v = 2.0 m/s² · 5.0 s = 10 m/s

8 0
3 years ago
amber walks towards the back of a train at 3mph. The train is moving foward at 65mph. Find the velocity of amber relative on the
andrew11 [14]

Answer: 62mph

Explanation:

8 0
3 years ago
How much heat is needed to raise the temperature of 8g of water by 15oC?
Murrr4er [49]
<h2>Answer: 502.08 J</h2>

Explanation:

The heat (thermal energy) needed in to raise the temperature in a process can be found using the following equation:

Q=m.C.\Delta T   (1)

Where:

Q is the heat

m=8 g is the mass of the element (<u>water</u> in this case)

C is the specific heat capacity of the material. In the case of water is C=4.184\frac{J}{g\°C}

\Delta T=15\°C is the variation in temperature  <u>(which is increased in this case)</u>

Knowing this, let's rewrite (1) with these values:

Q=(8 g)(4.184\frac{J}{g\°C})(15\°C)  (2)

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5 0
3 years ago
Consider a system of two particles: ball A with a mass m is moving to the right a speed 2v and ball B with a mass 3m is moving t
arlik [135]

Answer:

Explanation:

Answer:

Explanation:

Given that,

System of two particle

Ball A has mass

Ma = m

Ball A is moving to the right (positive x axis) with velocity of

Va = 2v •i

Ball B has a mass

Mb = 3m

Ball B is moving to left (negative x axis) with a velocity of

Vb = -v •i

Velocity of centre of mass Vcm?

Velocity of centre of mass can be calculated using

Vcm = 1/M ΣMi•Vi

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M = M1 + M2 + M3 +...

Therefore,

Vcm=[1/(Ma + Mb)] × (Ma•Va +Mb•Vb

Rearranging for better understanding

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Vcm = (m•2v + 3m•-v) / (m + 3m)

Vcm = (2mv — 3mv) / 4m

Vcm = —mv / 4m

Vcm = —v / 4

Vcm = —¼V •i

3 0
3 years ago
The number of players on a regulation Basketball Team?
mixer [17]
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I hope this helps!
</span>
5 0
3 years ago
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