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Delicious77 [7]
3 years ago
5

Ali and Abdi go for a walk along an abandoned railroad truck , Ali puts one ear next to a rail, while Abdi 300m away taps in the

rail with a stone . How much sooner does Ali hear the sound (speed of sound in steel is 6500m/s).
Physics
1 answer:
Free_Kalibri [48]3 years ago
7 0

Answer:

Ali hear the sound in 0.046 seconds.

Explanation:

Given:

Distance between Ali and Abdi =  300m

Speed of sound in steel = 6500m/s

To Find :

How much sooner does Ali hear the sound = ?

Solution:

We can find the time in which the sound made by Abdi with a stone on the rail by using the speed formula

We know that

Speed = \frac{Distance}{time}\\

On substituting the given values,

6500 = \frac{300}{time}\\

time = \frac{300}{6500}\\

time = \frac{300}{6500}\\

Time  = 0.046 seconds

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<u>Answer:</u>


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3 0
3 years ago
What is an example of kinetic energy
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An airplane has a large amount of kinetic energy in flight due to its large mass and fast velocity.

6 0
3 years ago
A rock climber hangs freely from a nylon rope that is 15 m long and has a diameter of 8.3 mm. If the rope stretches 5.1 cm, what
irinina [24]

Answer:

Mass of the climber = 69.38 kg

Explanation:

Change in length

        \Delta L=\frac{PL}{AE}

Load, P = m x 9.81 = 9.81m

Young's modulus, Y = 0.37 x 10¹⁰ N/m²

Area

       A=\frac{\pi (8.3\times 10^{-3})^2}{4}=5.41\times 10^{-5}m^2

Length, L = 15 m

ΔL = 5.1 cm = 0.051 m

Substituting

       0.051=\frac{9.81m\times 15}{5.41\times 10^{-5}\times 0.37\times 10^{10}}\\\\m=69.38kg  

Mass of the climber = 69.38 kg

6 0
3 years ago
Which of the following is an example of mechanical waves?
Nastasia [14]
Sound Waves will be an example of mechanical waves.. hope this helps!
8 0
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olga_2 [115]

Answer:

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Explanation:

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W = mg

g is acceleration due to gravity on the surface of earth

Hence, the correct option is (d).

6 0
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