Physics, 19.01.2021 14:00 djfluffyman999

There is an explosion on the surface of a lake and two person Seema and John hear it's sound. Seema is 150m away on a boat and. John is 150 m below the surface of water. Who would hear the sound first and why?

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Answer from: getsic

John would hear the sound first because sound travels faster in water than in air

Explanation:

The location of the point of the explosion = On the water surface

The distance between Seema and the sound = 150 m

The medium through which the sound reaches Seema = Through the air

The distance between John and the sound = 150 m

The medium through which the sound reaches John = Through the water

The speed of sound in air = 343 m/s

The speed of sound in water = 1,481 m/s

The time it takes the sound to reach Seema, tₐ = 150 m/(343 m/s) ≈ 0.43732 seconds

The time it takes the sound to reach John, t_w = 150 m/(1,481 m/s) ≈ 0.10128 seconds

The difference in the time it takes sound to reach Seema and John = 0.43732 s - 0.10128 s = 0.33603 s

The sound reaches John approximately 0.33603 seconds before it reaches Seema

Therefore, John would hear the sound first because sound travels about 4.3 times faster in water than in air.

Answer from: Quest

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

happy to

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Answer from: Quest

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm. the wire diameter is d = 0.9 mm. the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2) in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

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There is an explosion on the surface of a lake and two person Seema and John hear it's sound. Seema...

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