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Serga [27]
3 years ago
9

Wood is sawed and made into a toy box. is it physical or chemical change

Physics
1 answer:
Rina8888 [55]3 years ago
5 0
It is a physical change, as only the dimensions changed, not the chemical structure.
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Answer:

156.67 m/s

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Explanation:

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Time taken by the blast waves to reach the ground = 2\ minutes\ 30\ seconds=2\times 60+30=150\ s

Spedd of the wave would be

Speed=\dfrac{Distance}{Time}\\\Rightarrow v_b=\dfrac{23500}{150}\\\Rightarrow v-b=156.67\ m/s

The velocity of the blast wave is 156.67 m/s

v = Velocity of sound = 343 m/s

\dfrac{v_b}{v}=\dfrac{156.67}{343}\\\Rightarrow v_b=v\dfrac{156.67}{343}\\\Rightarrow v_b=0.45676v

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