can u pls help me ........

Wouldn't it be B because it's a majority pointing to it?

Sorry if i'm wrong.

Answer:

the correct answer is A

Explanation:

This is a doppler effect exercise which is the change in frequency due to the relative movement of the sound source and the observer.

          [tex]f' = f_o \ \frac{v+v_o}{v-v_s}[/tex]

where v₀ is the speed of the observer and v_s the speed of the source, the signs correspond when the two are closing in

with this expression let's analyze the different answers

A) True. The observed change is in the frequency, in this case the two are moving away, so the expression that describes the phenomenon is

        [tex]f'= f_o \ \frac {v-v_o}{ v+v_s}[/tex]

In this case, the speed of the source is greater than the speed of the observer, so when the denominator increases faster than the numerator, consequently the frequency must decrease

B) False. The amplitude does not depend on the relative velocity

C) False. The intensity depends on the distance, by or which when increasing the distance the intensity should decrease

D) False. The speed of sound is a constant, if the frequency decreases the wavelength must increase to maintain equality

E) False. The speed of sound depends on the properties of the propagating medium, not on the relative speed of the source and the observer.

Consequently the correct answer is A

Answer:

d) Similar and joined in series

Explanation:

In a series combination of resistors, the current throughout the circuit remains the same, while the total voltage across the circuit is the sum of the voltage across each resistor connected in the circuit.

[tex]V_{Total} = V_{1}+V_{2}+V_{3}+...+V_{N}[/tex]

Now, if we consider that all the resistors are similar having rgw same value of resistance. So for the same value of resistance and current, the voltage drop across each resistor will also be the same.

[tex]V_{Total} = V+V+V+...+V(upto\ N\ resistors)\\V_{Total} = NV_{Resistor}\\V_{Resistor=}\frac{V_{Total}}{N}[/tex]

Hence, the correct option is:

d) Similar and joined in series

Answer:

Snell's Law states

Ni sin i = Nr sin r

Judging from the question the source of the ray is in the water (directed up)

or NI = 1 / sin 49      Ni = 1.325 deg     the critical angle

From inside the pond:

Nr = 1.325 * sin 45 / 1 = 94 deg  

So refraction can occur  outside the pond and you do not have total internal refection.

Answer:

3.69 m/s²

Explanation:

weight = mass × Acceleration of gravity

479.96 = 129.72 × Acceleration of gravity

Acceleration of gravity = 479.96/129.72 = 3.69 m/s²

Answer:

c baseball

Explanation:

the baseball traveling at 40m/seg

Oh god someone sent something really bad, I only saw it for a few seconds. Honestly you should re post this question, jeez...

Answer:

* for the condition the velocity in column A is less than in column B

   all the answers are false

* the speed of sound in column A is greater than in column B

      True b and c

Explanation:

This interesting exercise we have a mixture of the resonance conditions and the conditions for the speed of sound.

The resonance condition is that at the closed end we have a node and at the open end a belly

          λ = 4L        first harmonic (fundamental)

The conditions of the speed of sound are

         v = [tex]\sqrt{\frac{B}{ \rho } }[/tex]

the velocity for air is v = 343 m/s at 20ºC and for argon it is v = 670 m/s at 20ºC

Another relationship is that the density of a gas depends on the temperature

            v = v₀ [tex]\sqrt{1 + \frac{T}{273} }[/tex]

v₀ is the speed of sound at 0ºC

let's examine the different answers

* for the condition the velocity in column A is less than in column B

a) False. The resonance does not depend on the diameter but on the length of the column

b) False. The speed of sound in argon is greater than in air, the volume modulus of argon is greater

c) False. The speed depends on the root of the temperature, increasing the temperature increases the speed of sound.

As you can see in this case all the answers are false, let's change the condition

* the speed of sound in column A is greater than in column B

a) False

b) True

c) True

Answer:

The Nucleus of an atom change

Explanation:

Ap3x

Answer:

The net force is 0.

Explanation:

If I pull to the left with 400 N and you pull to the right with 400 N, we're going in opposite directions. If the left is negative (-400N) and the right is positive (+400N), add them to get the resultant force.

Answer:

Friction

Explanation:

Answer:  The younger elliptical and lenticular galaxies had results similar to spiral galaxies like the Milky Way. The researchers found that the older galaxies have a larger fraction of low-mass stars than their younger counterparts.

Explanation:

Answer:

Explanation:

Given that:

[tex]mass \ m_ 1 = 11.0 \ kg[/tex]

[tex]mass \ m_2 = 19.0 \ kg[/tex]

[tex]mass \ of \ the \ pulley\ M = 7.90 \ kg[/tex]

[tex]Radius \ of \ the \ pulley = 0.200\ m[/tex]

1) Provided that the mass in [tex]m_2[/tex] is greater than the mass we have in [tex]m_1[/tex], then likewise the tension we have in [tex]T_2[/tex] will be greater than the tension in [tex]T_1[/tex]

Using Newton's second law to mass [tex]m_1[/tex], we have:

[tex]m_2g - T_2 = m_2 a \\ \\ T_1 = m_1 g +m_1 a \\ \\ T_1= m_1 (g+a) --- (1)[/tex]

By using the second law, we have:

[tex]m_2g - T_2 = m_2a \\ \\ T_2 = m_2 (g-a)---(2)[/tex]

For the pulley, let's use the torque equation, so we have:

[tex]T_2 r -T_1 r = I \alpha \\ \\ T_2r -T_1r = \Big ( \dfrac{Mr^2}{2}\Big) \dfrac{a}{r} \\ \\ T_2 -T_1 = \dfrac{Ma}{2} ---- (3)[/tex]

Altogether, from equation (1)(2) and (3), we have:

[tex]m_2(g-a) -m_1 (g+a) = \dfrac{Ma}{2} \\ \\ m_2g -m_2a -m_1g-m_1a = \dfrac{Ma}{2} \\ \\ a = \dfrac{(m_2 -m_1) g}{(m_1 + m_2 + \dfrac{M}{2})} \\ \\ a = \dfrac{(19.0 \ kg - 11.0 \ kg ) ( 9.8 \ m/s^2)}{(19.0 \ kg + 11.0 \ kg + \dfrac{7.90 \ kg }{2} )}[/tex]

[tex]a = 2.31 \ m/s^2[/tex]

Also; from equation (1), the tension in the string is:

[tex]T_1[/tex] = (11.0 kg ) ( 9.8 + 2.31) m/s²

[tex]T_1[/tex] = 133.21 N

[tex]T_1[/tex] ≅ 133 N

From equation (2):

[tex]T_1[/tex] = m_2(g-a)

[tex]T_1[/tex] = (19.0 kg) ( 9.8 - 2.31) m/s²

[tex]T_1[/tex] = 142.31 N

[tex]T_1[/tex]  = 142 N

Answer:

Convection currents

Explanation:

As hot air cools it sinks back to the surface of the earth, where it gets warmed by the ocean only to rise again. This is called a convection current. Convection currents are defined as room air rising and cold air sinking

~Hope this helps

~Bre

Answer:

Value of Q when W = 288 is 192

Explanation:

Given that;

q varies as w [Using ratio property]

Given that value of q = 24

And value of w = 36

Find:

Value of Q when W = 288

Computation:

If Q varies as W

So their ratio must be same

So, using ratio property for find factor

q / w = Q / W

24 / 36 = Q / 288

Q = [24 x 288] / 36

Q = 6,912 / 36

Value of Q when W = 288 is 192

we know that,

Frequency = 1/ time period

hence, Feq = 1/5 ===> 0.2 Hz

hence, wave velocity = freq * wavelength

hence,

V = 0.2 * 100

==> Wave velocity = 20 m/s

Answer:

D. Friction is the type of force

Answer:

a.It is bulb A

b.They will have less light, because they are in series

c.It will have more light because all tge current will flow to one bulb which is A

a)Light bulb A will be brightest.

b)Because they are connected, they will have less light if light bulb A is removed.

c)Bulb A and B will light more. If light bulb C is removed.

An electric bulb is a gadget that uses electricity to create visible light. It is the most popular type of artificial lighting and is necessary for modern society.

When one bulb in a series circuit burns, out, the rest of the bulbs will light. Hence, the following result is obtained;

a)Light bulb A will be brightest.

b)Because they are connected, they will have less light if light bulb A is removed.

c)Bulb A and B will light more. If light bulb C is removed.

To learn more about the electric bulb refer to the link;

brainly.com/question/4723473

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Answer:

0.647 meters

Explanation:

i did the quiz

Answer:

Explanation:

As the 1-meter string is at a 10° angle, the radius of horizontal circle Barbie is whirled will be = 1*cos(10°) meter.

Once the rotation speed is given, then multiple that by cos(10°) will be the tangential speed.

Answer:

Explanation:

cant calculate as no speed is given but the tangential speed is

= rotation speed x radius x cos 10.°

= rotation speed x cos  10.°

Answer:

Virtual

Explanation:

Answer:

B. Virtual

Good Luck!

Answer:

1.33

Explanation:

According to snell's law,

n = sin(a)/sin(b)

Given

a = 25.0°

b = 18.5°

Substitute

n = sin25/sin18.5

n = 0.4226/0.3173

n = 1.33

Hence the index of refraction nb for this type of glass is 1.33

Answer:

the number of turns in the winding is 387 turns.

Explanation:

Given;

radius of the solenoid, r = 0.12 m

cross sectional area of the solenoid, A = 20 x 10⁻⁴ m²

current flowing through the solenoid, I = 20 A

the energy of the flowing current, E = 0.1 J

The energy stored in solenoid is given as;

[tex]U = \frac{1}{2} LI^2\\\\L = \frac{2U}{I^2} \\\\L = \frac{2 \times 0.1}{20^2} \\\\L = 5 \times 10^{-4} \ H[/tex]

The number of turns in the winding is calculated as follows;

[tex]L = \frac{\mu_o N^2A}{2\pi r} \\\\N^2 = \frac{2\pi r L}{\mu_o A} \\\\N = \sqrt{\frac{2\pi r L}{\mu_o A}} \\\\N = \sqrt{\frac{2\pi \times 0.12 \times 5\times 10^{-4} }{4\pi \times 10^{-7} \times 20\times 10^{-4} }}\\\\N = 387 \ turns[/tex]

Therefore, the number of turns in the winding is 387 turns.

Answer:oxidation number

Explanation:

i just took quiz;)

The ratio of the elements in a binary ionic compound are based on the element's oxidation number.

Oxidation number can be generally described as the number which is allocated to the chemical elements in a chemical combination of different compounds. The oxidation number of an element is basically the number or count of electrons that atoms in a molecule can share, lose or gain while they are forming chemical bonds with the other atoms of a different element or atom.

The oxidation state, or oxidation number is the hypothetical charge which is present on an atom if all of the bonds in an atom to different atoms were fully ionic in nature. Oxidation state describes the degree of oxidation of an atom in a chemical compound or molecule. The oxidation state may be positive, negative or zero depending upon the loss or gain of electrons.

Learn more about Oxidation number here:

https://brainly.com/question/29263066

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Answer

t = 367.77 s = 6.13 min

Explanation:

According to the law of conservation of energy:

[tex]Heat\ Supplied\ By \ Heater = Heat\ Absorbed\ by\ Glass + Heat\ Absorbed\ by\ Water\\Pt = m_gC_g\Delta T_g + m_wC_w\Delta T_w\\[/tex]

where,

P = Electric Power of Heater =  300 W

t = time required = ?

m_g = mass of glass = 300 g = 0.3 kg

m_w = mass of water = 250 g = 0.25 kg

C_g = speicific heat of glass = 840 J/kg.°C

C_w =  specific heatof water = 4184 J/kg.°C

ΔT_g = ΔT_w = Change in Temperature of Glass and water = 100°C - 15°C

ΔT_g = ΔT_w = 85°C

Therefore,

[tex](300\ W)(t) = (0.3\ kg)(840\ J/kg.^oC)(85^oC)+(0.25\ kg)(4184\ J/kg.^oC)(85^oC)\\[/tex]

t = 367.77 s = 6.13 min

Answer: Computed tomography (CT) is an imaging tool that combines x-rays with computer technology to produce a more detailed, cross-sectional image of your body. A CT scan lets your doctor see the size, shape, and position of structures that are deep inside your body, such as organs, tissues, or tumors.

So, the answer must be a CT scan. I may be wrong.

Answer:

B. CT SCAN

Explanation:

Edge 2021

Answer:

manage your weight better, have stronger bones, have lower blood pressure, less risk of a heart attack, etc.

Answer:

You become healthier, your body starts regulating better, you get stronger bones and muscles, and you lower the risk of diabetes,heart problems and other diseases.