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Sindrei [870]
3 years ago
14

As the train in the image moves to the right how does the train horn sound to person a?

Physics
2 answers:
MissTica3 years ago
4 0

Answer:

D. The pitch does not change.

Explanation:

When the source of sound moves away, the pitch drops. and when the source of sound approaches the pitch rises. This is called'Doppler effect'.

Here the person a and the sound horn are both in the same vehicle. Which means their relative velocity is zero. So the horn is neither approaching nor receding the person A

If  the source is approaching

f_{new}= \frac{v_{sound} }{v_{sound} -v_{source} }f_{original}

If the source is receding

f_{new}= \frac{v_{sound} }{v_{sound} +v_{source} }f_{original}

Hence the right answer is option D. The pitch does not change

alina1380 [7]3 years ago
3 0

Answer:

Explanation:

Person A's velocity relative to the train is 0.  Therefore, the pitch of the horn will not change.

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Analyze why a body undergoing uniform motion eventually comes to rest even in the
djverab [1.8K]

Answer:

It happens due to force of friction

Explanation:

If a body is performing a uniform motion and no external unbalanced force appears to apply on it, then  the body will come to rest after certain time. The reason behind this is the force of friction that is applied in opposite direction of the motion. So, when there is no apparent unbalanced force it means that the only force acting on the body is the force of friction. This force of friction tends to stop the motion after some period of time, because it is acting in the direction opposite to that of motion.

Hence, the reason behind a body undergoing uniform motion eventually stops is <u>Force of Friction.</u>

8 0
3 years ago
What is the final equilibrium temperature when 12 g of milk at 7◦C is added to 175 g of coffee at 69◦C? Assume the specific heats o
lina2011 [118]

Answer:

final equilibrium temperature  is 65.02 ◦C

Explanation:

Given data

milk = 12 g

temp milk =  7◦C

coffee = 175 g

coffee temp = 69◦C

to find out

final equilibrium temperature

solution

we apply here equilibrium condition i.e m c ΔT

milk mass × c × ΔT  = coffee mass × c × ΔT

12 × 1 × (T- 7)  = 175 × 1 × ( 69- T)

12T - 84 = 12075 - 175 T

187 T = 12159

T = 65.02

so final equilibrium temperature  is 65.02 ◦C

3 0
4 years ago
A lab assistant has been given data with units from an experiment to enter into the computer. Unfortunately, there are only numb
san4es73 [151]

Answer:

the answer ia A

Explanation:

3 0
3 years ago
How high up is a 3.00 kg object that has 300.j of energy
loris [4]

Answer:

10.20meters

Explanation:

8 0
3 years ago
Read 2 more answers
Help with 5 and the question below. BRAINLIEST FOR THE CORRECT ANSWER! Urgent Physics help!
krok68 [10]

Sound level at distance of 15 m is given as 20 dB

so intensity at this distance is given as

L = 10 Log\frac{I}{I_0}

20 = 10 Log{I}{10^{-12}}

I_1 = 10^{-10}W/m^2

now if we move closer to some some distance the sound level is now 50 dB

now the intensity is given as

L = 10 Log\frac{I}{I_0}

50 = 10Log\frac{I}{10^{-12}}

I_2 = 10^{-7}W/m^2

now we know that

\frac{I_1}{I_2} = \frac{r_2^2}{r_1^2}

\frac{10^{-10}}{10^{-7}} = \frac{r_2^2}{15^2}

r_2 = 47 cm

so now the distance from friend must be 47 cm

8 0
3 years ago
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