A SONAR used in a ship sends ultrasound waves and receives the echo after 2.0 s.Find the depth of the shoal of fish if the speed of sound in water is 1250 m/s

Given :

A SONAR used in a ship sends ultrasound waves and receives the echo after 2.0 s.

To Find :

The depth of the shoal of fish if the speed of sound in water is 1250 m/s.

Solution :

Let, the depth of the shoal fish is d.

Now, it is given that it takes 2.0 s to receive the echo.

Also, distance covered by echo is 2d.

Now, 2d = s × t

2d =  1250 m/s × 2 s

d = 1250 m

Therefore, the depth of the shoal of fish is 1250 m.

Area of the house and porch is 875 square feet.

Step-by-step explanation:

Given question is incomplete: find the complete question in the attachment.

From the figure attached,

Area of the octagonal house and porch = Area of the rectangle - Area of two rectangles cut off from the top corners of the rectangle

Area of the rectangle = 30×30 = 900 square feet

Area of the triangles =

                                  = 25 square feet

Area of the house and porch = 900 - 25

                                                = 875 square feet

Therefore, area of the house and porch is 875 square feet.