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Elis [28]
4 years ago
9

In the diagram below, a stationary source located at point S produces sound having a constant frequency of 512 hertz. Observer A

, 50 meters to the left of S, hears a frequency of 512 hertz. Observer B, 100.0 meters to the right of S, hears a frequency lower than 512 hertz.
A) Observer A is stationary, and observer B is moving away from point S.

B) Observer A is stationary, and observer B is moving toward point S.

C) Observer A is moving away from point S, and observer B is stationary.

D) Observer A is moving toward point S, and observer B is stationary.
Physics
1 answer:
Nikolay [14]4 years ago
4 0
This has to do with Doppler effect. If the source or the observer moves, they the observer will hear a different frequency. Since the source is stationary, we only need to know whether the observer is moving.

Since Observer A does not hear a change in frequency, he a must be stationary. So we can ignore C and D

Since Observer B hears a different frequency, Observer B must be moving. Here's the tricky part. We need to find whether B is moving towards or away the source. Since he hears a lower frequency, he is walking away from the source. So the answer is A.

You can conform with the Doppler equation.

Answer: A
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charle [14.2K]

Answer:

The current flowing through the wire is 9 A.

Explanation:

Given;

quantity of charge passing through the wire, Q = 36 C

duration of the charge flow, t = 4 s

The current flowing through the wire is calculated as;

Q = It

I = Q / t

where;

I is the current flowing in the wire

I = 36/4

I = 9 A

Therefore, the current flowing through the wire is 9 A.

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____ is the thermal energy transfer that occurs from the motion of fluid in a liquid or gas.
Marysya12 [62]
The answer is C. Convection.

Radiation is the transfer of energy through electromagnetic waves. Conduction, on the other hand, is energy transfer through solid material. Condensation occurs when warm gas makes contact with a cold surface or environment, which causes a change in state from gas to liquid. These definitions rule out choices A, B, and D. 

Convection is movement of particles in fluid or gas. As liquid/gas heats up, it becomes less dense and rises, moving away from the heat source. When it rises, it eventually cools down and sinks again. It is warmed up again and the cycle continues. This is why there is a circular motion when convection occurs. 
6 0
3 years ago
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check the state of polarization of the room lights by looking at the room lights through one of the polarizers and rotating it t
maria [59]

Answer:

No, there wasn't any variation in the light intensity at 360 degrees.

During the rotation, rotating through an angle of 90° gradually brought the intensity to a maximum. Rotating by another 90° degrees brought the intensity to a minimum at some point. Rotating by another 90° brought it back to its maximum and then another 90° brought it to its initial intensity.

4 0
3 years ago
in a collusion, a 15 kg object moving with a velocity of 3 m/s transfers all of its momentum to a 5 kg object. what would be the
Hunter-Best [27]
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15*3 = 45kgm/s
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7 0
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Some hydrogen gas is enclosed within a chamber being held at 200^\ { C} with a volume of 0.025 \rm m^3. The chamber is fitted wi
vlada-n [284]

Answer:

The final volume is 0.039 m^3

Explanation:

<u>Data:</u>

Initial temperature: T1=200C

Final temperature: T2=200C

Initial pressure: P1=1.50 \times10^6 Pa

Final pressure: P2=0.950 \times10^6 Pa

Initial volume: V1=0.025m^{3}

Final volume: V2=?

Assuming hydrogen gas as a perfect gas it satisfies the perfect gas equation:

\frac{PV}{T}=nR (1)

With P the pressure, V the volume, T the temperature, R the perfect gas constant and n the number of moles. If no gas escapes the number of moles of the gas remain constant so the right side of equation (1) is a constant, that allows to equate:

\frac{P_{1}V_{1}}{T_{1}}=\frac{P_{2}V_{2}}{T_{2}}

Subscript 2 referring to final state and 1 to initial state.

solving for V2:

V_{2}=\frac{P_{1}V_{1}T_{2}}{T_{1}P_{2}}=\frac{(1.50 \times10^6)(0.025)(200)}{(200)(0.950 \times10^6)}

V_{2}=0.039 m^3

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