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Rina8888 [55]
2 years ago
6

Whoever is good at physics, can you help me with these questions?

Physics
2 answers:
qwelly [4]2 years ago
5 0

Answer:

i honestly do not know the awnser , im just setting up my brainly account

Anna [14]2 years ago
5 0

Answer:

Q)32) What is the unit of intensity of sound

Ans)Decibel

Q)33) Relate amplitude and distance to the intensity and loudness of sound

Ans)The average amount of energy passing through a unit area per unit of time in a specified direction is called the intensity of the wave. As the amplitude of the sound wave increases, the intensity of the sound increases. (i can't find the answer for distance and loudness i can't find it on g....o...o....g....l.....e and my textbook u will have to search it on ur own sorry)

Q)34) What is the pitch of sound

Pitch is the rise and fall of our voice when we speak. It is the characteristic of sound by which we can distinguish the sounds of the same loudness. Types: Pitch is generally of two types, high pitch and low pitch. High Pitch: The higher the frequency of the sound, the higher will be the pitch.

Q)35) How is pitch of sound related to its frequency of sound waves?

The sensation of a frequency is commonly referred to as the pitch of a sound. The pitch of the sound we hear depends on the frequency of the sound wave. A high frequency sound wave has a high pitch, and a low frequency sound has a low pitch.

Q)36) Define the Doppler effect?

The apparent change in the frequency of sound due to the relative motion between the source and the observer is called the Doppler effect.

Q)37) Explain why the doppler effect occurs

The Doppler effect, or Doppler shift, occurs when the movement of an observer relative to a source (or vice versa) causes a change in wavelength or frequency.

Sorry i can't find the last one i will try to search it afterwards

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A particle with charge 8 µC is located on the
Oksi-84 [34.3K]

Answer: 34.65 N towards charge 8 μC.

Explanation:

The electrostatic force between two charges is given by:

F =k \frac{q_1q_2}{r^2}

where, k is the Coulomb constant = 8.9875 × 10⁹ N.m²/C²

q₁ and q₂ are the two charges separated by distance r.

The distance between charges 8 μC and -7 μC is r = 2 cm -(-10 cm) = 12 cm = 0.12 m

The force between these charges is:

F = 8.9875 \times 10^9 Nm^2/C^2 \times \frac{8\times 10^{-6}C\times (-7\times10^{-6}C)}{(0.12m)^2} = -34.95 N

Negative sign implies it is an attractive force.

The distance between -3 μC charge and -7 μC charge is r' = 10 cm -2 cm = 8 cm = 0.8 m.

The electrostatic force between these charges is:

F' = 8.9875\times 10^9Nm^2/C^2\times \frac{(-3 \times 10^{-6}C)\times (-7\times 10^{-6}C)}{(0.8m)^2} = 0.295 N

It is a repulsive force.

Net force on the -7 μC charge is:

Fn = F + F'

we can add them directly as they are acting in one direction along the x-axis.

Fn = -34.95 N + 0.295 = -34.65 N

Thus, the net force is attractive in nature and it is towards charge 8 μC.

8 0
3 years ago
A Ferris wheel car is moving in a circular path at a constant speed. Is the car accelerating?
Gemiola [76]
No it is not because it’s moving at a constant speed
7 0
3 years ago
A disk drive plugged into a 120V outlet operates on a voltage of 12V . The transformer that powers the disk drive has 125 turns
Serga [27]

Answer:

(A-) Number of turns in secondary coil will be<u> less than 125.</u>

(B-) EXPLAIN- The voltage is to be lowered.<u> The voltage will be reduced from 120 to 9 volts.</u> As a result, a<u> step down transformer </u>will be used, indicating that the secondary coil's number of turns would be less than 125.

(C-)<u> The number of turns on the secondary coil is 12.5</u>

<u></u>

Explanation:

  • STEP DOWN TRANSFORMER - A step-down transformer transforms high voltage (HV) and low current from the transformer's primary side to low voltage (LV) and high current on the secondary side. A phase down transformer is the opposite of this.

In electrical networks and transmission lines, a step-down transformer can be used in a number of ways.

<u>Step down transformer formula-</u>

                  V_s=\frac{N_s\times V_p}{N_p}

We are given with the -

Primary voltage V_p = 120V

Secondary voltage Vs=12V

Number of primary turns N_p=125

  • <u>To calculate the number of turns on the secondary coil -</u>

       Since , the transformer ratio is given as -

                   \frac{N_s}{N_p} =\frac{V_s}{V_p}

So, the number of turns on the secondary coil is - N_s=N_p\times\frac{V_p}{V_s}

            Putting , the given values -:

                125\times\frac{12}{120}

         =   12.5

<u>Therefore , the number of turns on secondary coil is 12.5 .</u>

6 0
3 years ago
A light beam which is amplified into a strong concetrated beam of light is known as A) a laser. B) a transistor. C) a microwave
murzikaleks [220]

The correct answer is A. a <em>Laser</em>.

4 0
3 years ago
Read 2 more answers
What is the formula for sodium sulfide?
Dimas [21]

Hello there!

The formula for sodium sulfide is Na2S.

Hope this helps!

3 0
3 years ago
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