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erastova [34]
3 years ago
5

A violinist is tuning her violin to 440Hz. She plays the note while listening to an electronically generated tone and hears 3Hz,

which increases to 4Hz when she tightens the violin. What was the frequency of the note played by the violin when she heard the 3 Hz beats
Physics
1 answer:
BartSMP [9]3 years ago
5 0

Answer:

X=438Hz

Explanation:

From the question we are told that:

Beat Frequency Fb=440Hz

Actual Frequency F_a=3Hz

Generally the equation for Frequency Heard X is mathematically given by

X=beat\ frequency\ +\ actual\ frequency

X=F_a+Fb

X= 440Hz+3Hz

X=438Hz

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A 50 mL graduated cylinder contains 25.0 mL of water. A 42.5040 g piece of gold is placed in the graduated cylinder and the wate
Elenna [48]

Answer:

19320 kg/m³

Explanation:

density: This can be defined as the ratio of the mass of a body to its volume. The S.I unit of Density is kg/m³.

The formula of density is given as,

D = m/v ......................... Equation 1.

Where D = Density of the gold, m = mass of the gold, v = volume of the gold.

Note: From Archimedes's Principle, the piece of gold displace an amount of water that is equal to it's volume.

Amount of water displace = 27.2 - 25 = 2.2 mL.

Given: m = 42.504 g = 0.042504 kg, v = 2.2 mL = (2.2/10⁶) m³ = 0.0000022 m³

Substitute into equation 1

D = 0.042504/0.0000022

D = 19320 kg/m³

Hence the density of the piece of gold = 19320 kg/m³

5 0
3 years ago
What angle of sunlight do we have in the northern hemisphere when it is winter?
muminat

Answer:

Indirect

Explanation:

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5 0
3 years ago
Which of the following represents a chemical change? (1 point)
fgiga [73]
Can I see a photo or can you comment the answer choices.
8 0
3 years ago
If we decrease the size of a quantum dot that contains an electron, what happens to the energy levels?
Law Incorporation [45]

We will solve this problem using the direct concept related to band gap energy, that is, a band gap is the distance between the valence band of electrons and the conduction band, i. e, the energy range in a solid where no electron states (Electronic state) can exist Mathematically can be described as,

E_n = \frac{h^2n^2}{8mcR^2}

Where,

h = Planck's constant

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mc = Effective mass of the point charge

R = Size of the particle

As you can see the energy is inversely proportional to the size of the particle:

E_n \propto \frac{1}{R^2}

Therefore if the size is decreased, the amount of energy is increased.

6 0
3 years ago
A car starts from rest and after 7.0 seconds it is moving at 42 m/s. What is the car's average acceleration?
andriy [413]
<h2>Answer:</h2>

<em>Hello, </em>

<h3><u>Q</u><u>UESTION)</u></h3>

<em>✔ We have : a = v/Δt </em>

  • a = 426/7
  • a = 6 m/s²

The car's acceleration is therefore 6 m/s².

8 0
3 years ago
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