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seraphim [82]
3 years ago
10

The temperature of the air in a valley begins to increase after the sun comes up and heats the valley floor. What will happen to

the velocity of sound in this valley?The velocity will increase.The velocity will decrease.The velocity will not change.The velocity will drop to zero.
Physics
1 answer:
andreev551 [17]3 years ago
8 0
I think it will increase a little bit...just image ..if the temperature is 0,the velocity will be 0 too.because the vibration of atom is so weak and the sound cant progation.
so.when  the temp inc ,the velocity inc too.
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AgNO3(aq)+NaCl(aq)—>|NaN03(aq)+AgCl(s)
ASHA 777 [7]

the answer to the question is (D)

8 0
3 years ago
According to string theory, six space-time dimensions cannot be measured except as quantum numbers of internal particle properti
m_a_m_a [10]

Answer:

10^{-35}\ meters

Explanation:

The string theory is a theoretical concept, the very small particles of particle physics are rep[laced by strings. This theory also applies to black hole physics, nuclear physics, cosmology etc.

According to string theory, six space-time dimensions cannot be measured except as quantum numbers of internal particle properties because they are curled up in size of the order of 10^{-35}\ m.

The length of the scale is assumed to be on the order of 10^{-35}\ m. Hence, the correct option is (a).

5 0
3 years ago
Calculating ph how is ph related to the concentration of hydronium ions. True or False
Dmitry_Shevchenko [17]

I think this is TRUE. Ph is calculating the acidic acids in water. And you need to know the concentration of hydronium ions. Hope this helped !

7 0
3 years ago
Two identical pebbles are dropped. The first is dropped from a height of 256 feet and the second is dropped from a height of 400
ehidna [41]

Answer:

4.022 seconds and 4.99 seconds

Explanation:

Hello!

The free fall of the stone corresponds to a uniformly varied rectilinear movement

d=V_0*t+1/2*g*t^2

Being a free fall the initial speed is zero.

The distance is positive when considered in the same direction and direction as acceleration and speed.

256 feet stone

79.25 m=0 m⁄s*t+1/2*9,8 m⁄s^2 *t^2

t = 4.022 seconds

400 feet stone

121.92m=0 m⁄s*t+1/2*9,8 m⁄s^2 *t^2

t= 4,99 seconds

success with your homework!

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8 0
3 years ago
An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle
Dovator [93]

Answer:The velocity of the train is 3.84m/s

Explanation:

According to the Doppler effect, if the source is moving towards you then the apparent frequency of the sound emitted by the source is higher and if the source is moving away from you then the apparent frequency of the sound emitted by the source is smaller.

This is given by:

fo = V +-Vo/ V +-Vo × source

Where fo= observed frequency

V= velocity of sound

Vo= vo it of the observer

fsource= frequency the source

Given:

Observed frequency of the approaching train fo1= 452Hz

The observed frequency of train= fo2= 442Hz

Velocity of sound= 334m/s

Velocity of source=?

Train approaching the observer is given by:

fo1= V/(V - Vs)× source ...eq1

Train passes the student is given by:

fo2= V/(V - Vs)×source ...eq2

Divide eq1 by eq2

452/442 = (343+Vs)/(343 - Vs)

1.02 =(343+Vs)/(343 -Vs)

Cross multiply

1.02(343- Vs) = 343 + Vs

350.76 - 1.02Vs = 343 + Vs

Collecting like terms

350.76 -343= 1.02Vs+ Vs

7.76 = 2.02Vs

Vs= 7.76/2.02

Vs= 3.84m/s

4 0
3 years ago
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