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2 years ago

A group of hikers hear an echo 3.3 s after they shout. The temperature is 20◦C.

Physics

1 answer:

romanna [79]2 years ago

4 0

Answer:

560 m

Explanation:

The speed of sound in air is approximately:

v ≈ v₀ + 0.6T

where v₀ is the speed of sound at 0°C (273 K) in m/s, and T is the temperature in Celsius.

The speed of sound at 20°C at that altitude is:

v ≈ 327 + 0.6(20)

v ≈ 339 m/s

The sound travels from the hikers to the mountain and back again, so it travels twice the distance.

339 m/s = 2d / 3.3 s

2d = 1118.7 m

d = 559.35 m

Rounding, the mountain is approximately 560 m away.

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Cerrena [4.2K]

Answer:

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Explanation:

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so here we can say

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2 years ago

Which is the correct unit for electrical power? a) amp b) volt c) watt d) coulomb

musickatia [10]

The correct unit for electrical power is "watt".

That’s actually the unit that measures the rate per time that electric energy is transferred.

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2 years ago

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A volcano erupts and launches a chunk of hot magma horizontally with a speed of 252 m/s. The magma travels a horizontal distance

ArbitrLikvidat [17]

Answer:

The value is $v_y = -48.61 \ m/s$

Explanation:

From the question we are told that

The horizontal speed is $u_x = 252 \ m/s$

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Generally the time taken by the hot magma in air before landing is mathematically represented as

$t = \frac{d}{u_x}$

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=> $t = 4.96 \ s$

Generally the initial vertical velocity of the magma when it was lunched is

$u_y = 0 \ m/ s$

Then the final velocity of the magma when it hits the ground is mathematically represented s

$- v_y = u_y + gt$

Here the negative sign mean that the direction of the velocity is towards the negative y -axis

$- v_y = 48.61 \ m/s$

=> $v_y = -48.61 \ m/s$

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2 years ago

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g100num [7]

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v = 18720/2700

v = 6.933 or ~ 7 m/s

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2 years ago

Josie ran at an average speed of 16 m/s. if her mass 10 kg, what was her kinetic energy as she crosses her finish line?

Helen [10]

Answer: 1280 J

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1 year ago

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