Ask question

Ask question

All categories

2 years ago

7

a sound is sent at the bottom of a pond if echo is heard after 6 seconds calculate the depth of the pond .the speed of sound I'm

water is 1498m/s

1 answer:

Mama L [17]2 years ago

5 0

Answer:

Depth of the pond: 4494 m

Explanation:

if echo is heard after 6 seconds, it takes 3 seconds to reach to bottom of pond
so time will be 3 seconds and speed given 1498 m/s

Steps:

distance = speed * time
distance = 1498 * 3
distance = 4494 m

You might be interested in

10. Marvin is painting three squares shaped like

guapka [62]

Answer:

A certain cube has a side length of 25 m. How many square tiles, each with an area of 5 m2, are needed to fully cover the surface of the cube?

Possible Answers:

500

1000

200

100

750

Correct answer:

750

6 0

3 years ago

for homework create your own inequality below that represents a real word situation.solve your problem in to two ways , one corr

lisov135 [29]

Answer:

A. This passage is written incorrectly.

Why?

The reason for this is when you have quotation marks, you must put the punctuation inside the quotes.

How should the passage be written?

The passage should be written like this:

"Did you finish your homework?" Forrest asked.

"I have to write a summary of the book after I finish it," Jeff answered.

"I will leave you to it,"said Forrest. "By the way, its an exciting story," he added.

Instead of.....

"Happy Birthday, Rachel"! Lily cried.

its...

"Happy Birthday, Rachel!" Lily cried.

Instead of.....

Rachel replied sadly "Its been a horrible birthday".

its.......

Rachel replied sadly, "Its been a horrible birthday."

Instead of.....

"Why, Rachel? Its not supposed to be, right"? Lily said, surprised.

its..........

"Why, Rachel? Its not supposed to be, right?" Lily said, surprised.

*Note: I am dreadfully sorry for the typos. Hope this helps!!!

3 0

3 years ago

Write an equation that represents the line.

Fynjy0 [20]

Answer:

Y = 2/3X + 4/3

Step-by-step explanation:

(1,2) (4,4)

M = 2/3

Y = 2/3X + b

4 = 8/3 + b

12 = 8 + 3b

4 = 3b

B = 4/3

Y = 2/3X + 4/3

4 0

2 years ago

If the length, width, and height of a cube all change by a factor of eleven, what happens to the volume of the cube?

Vilka [71]

The volume of the new squad would be the volume of the original square times 11^2 which is 121

3 0

2 years ago

Read 2 more answers

An airplane travels 6111 kilometers against the wind in 9 hours and 7911 kilometers with the wind in the same amount of time. Wh

natima [27]

Answer:

Speed of the plane in still air: $779\; {\rm km \cdot h^{-1}}$ .

Windspeed: $100\; {\rm km \cdot h^{-1}}$ .

Step-by-step explanation:

Assume that $x\; {\rm km \cdot h^{-1}}$ is the speed of the plane in still air, and that $y\; {\rm km \cdot h^{-1}}$ is the speed of the wind.

When the plane is travelling against wind, the ground speed of this plane (speed of the plane relative to the ground) would be $(x - y)\; {\rm km \cdot h^{-1}}$ .
When this plane is travelling in the same direction as the wind, the ground speed of this plane would be $(x + y)\; {\rm km \cdot h^{-1}}$ .

The question states that when going against the wind ( $v = (x - y)\; {\rm km \cdot h^{-1}}$ ,) the plane travels $6111\; {\rm km}$ in $9\; {\rm h}$ . Hence, $9\, (x - y) = 6111$ .

Similarly, since the plane travels $7911\; {\rm km}$ in $9\; {\rm h}$ when travelling in the same direction as the wind ( $v = (x + y)\; {\rm km \cdot h^{-1}}$ ,) $9\, (x + y) = 7911$ .

Add the two equations to eliminate $y$ . Subtract the second equation from the first to eliminate $x$ . Solve this system of equations for $x$ and $y$ : $x = 779$ and $y = 100$ .

Hence, the speed of this plane in still air would be $779\; {\rm km \cdot h^{-1}}$ , whereas the speed of the wind would be $100\; {\rm km \cdot h^{-1}}$ .

3 0

1 year ago