A boy is standing in the middle of a big square field . There is a tall building on one side of the field. He explodes a cracker and hear its echo 0.45 later . What is the size of square field
Answers
Answered by
10
•A boy is standing in the middle of a
big square field . There is a tall
building on one side of the field.
He explodes a cracker and hear its
echo 0.45 later . What is the size of
square field ?
Let, the length of the side of the
square field be a, thus distance
between the boy and the field will
be a/2.
Here,
-Time of echo t 0.4 s
-Velocity of sound=330 m/s
-Distance D = a/2
Now we have,
V = 2D/t
=> 330 (2xa/2)/0.4
=> a = 132 m
Thus the length of the side of the square is 132 m
Area of field = 132×132
= 17424 square metre
Therefore, size of square field is 17424 square metre.
Similar questions
Hindi,
6 months ago
Social Sciences,
6 months ago
Physics,
1 year ago
Science,
1 year ago
English,
1 year ago