top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

A stone is dropped into a well of depth 67.6 m. The splash of water is heard..........Find the velocity of sound in m/s?

0 votes
499 views

A stone is dropped into a well of depth 67.6 m.
The splash of water is heard after 3.91 seconds.
Find the velocity of sound in m/s?

posted Nov 7, 2019 by Chahat Sharma

Share this puzzle
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

0 votes

S=ut+1/2gt^2
67.6=0*t+1/2*9.8*t^2 --> t= sqrt (676/49)=26/7 =3.71 sec - time the stone takes to touch the water
Time taken by sound to reach surface = 3.91–3.71=0.2 sec
Speed of sound = 67.6/0.2 m/sec= 338 m/sec

answer Nov 7, 2019 by Hanifa Mammadov



Similar Puzzles
+1 vote
In a car race, car A takes 4 seconds less than car B at the finish and passes the............Find the velocity v in m/s.

In a car race, car A takes 4 seconds less than car B at the finish and passes the finishing point with a velocity v more than the car B.
Assuming that the cars start from rest and travel with constant accelerations a1 = 4 ms^-2 and a2 = 1 ms^-2 respectively.
Find the velocity v in m/s.

0 votes
Calculate the maximum velocity of the particle in m/s?

A particle moves in a straight line such that the displacement x at any time 't' is given by
x = 6t^2 - t^3 - 3t - 4.
x is in meter and t is in seconds.
Calculate the maximum velocity of the particle in m/s?

0 votes
Find the height in metres from which he bails out of the plane?

A parachutist drops freely from an aeroplane for 10 seconds before the parachute opens out.
Then he descends with a net retardation of 2.5 m/s2 and strikes the ground with a velocity 5 m/s.
Find the height in metres from which he bails out of the plane?
( Take g = 10 m/s )

+1 vote
Find the position in metres from the origin at which A overtakes B?

Two buses A and B are at positions 50 m and 100 m from the origin at time t = 0.
They start moving in the same direction simultaneously with uniform velocity of 10 m/s and 5 m/s.
Find the position in metres from the origin at which A overtakes B?

0 votes
A helium balloon leaves the ground at a point A and rises vertically............what is the speed of the balloon in m/s?

A helium balloon leaves the ground at a point A and rises vertically at uniform speed.
At the end of 5 minutes, Rohan finds the angular elevation of the balloon as 30 degree.
If the point at which Rohan is standing is 550 m away from point A, what is the speed of the balloon in m/s?

...