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3 years ago

Which is a freshwater region characterized as a large standing body of water? A. lake B. river C. ocean D. stream

Physics

2 answers:

prisoha [69]3 years ago

5 0

Answer:

A. Lake

Explanation:

We need to recall that the water which contains less than 1% salts is called as freshwater.

In lakes water comes from rain, melting of ice from mountains, seepage of ground water, and water streams. These all are fresh sources of water. Therefore, A is the right answer.

B is not the right answer because river water dissolves salts while passing through the stones and riverbeds. So, water is not always fresh in rivers.

C is not correct, because ocean water contains a huge amount of salts.

Although streams have fresh water but they also have small size. Therefor, D is also not right answer.

Alexus [3.1K]3 years ago

4 0

This is A.) lake. A river is a small amount of water that isn't always fresh water. A stream is too small. And an ocean is made of salt water.

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Answer:

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Explanation:

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4 years ago

Two charges separated by one meter exert a 9 N force on each other. If the charges are pushed to a 3 meter separation, the force

tamaranim1 [39]

Answer:

False

Explanation:

The formula of force that exists between two charges is expressed as;

F = kq1q2/r²

If two charges separated by one meter exert a 9 N force on each other, the;

9 = kq1q2/1²

9 = kq1q2 ..... 1

If the charges are pushed to a 3 meter separation, then;

F = kq1q2/3²

F = kq1q2/9 .... 2

Divide both equations;

9/F = (kq1q2)/ kq1q2/9

9/F = kq1q2 * 9/ kq1q2

9/F = 9

F = 9/9

F = 1N

Hence if the charges are pushed to a 3 meter separation, then the force on EACH charge will be 1N. Hence the answer is False

3 0

3 years ago

The intensity of a sound wave at a fixed distance from a speaker vibrating at 1.00 kHz is 0.750 W/m2. (a) Determine the intensit

sveticcg [70]

Answer:

a) I = 3.63 W / m² , b) I = 0.750 W / m²

Explanation:

The intensity of a sound wave is given by the relation

I = P / A = ½ ρ v (2π f $s_{max}$ )²

I = (½ ρ v 4π² s_{max}²) f²

a) with the initial condition let's call the intensity Io

cte = (½ ρ v 4π² s_{max}²)

I₀ = cte s² f₀²

I₀ = cte 10 6

If frequency is increase f = 2.20 10³ Hz

I = constant (2.20 10³) 2

I = cte 4.84 10⁶

let's find the relationship of the two quantities

I / Io = 4.84

I = 4.84 Io

I = 4.84 0.750

I = 3.63 W / m²

b) in this case the frequency is reduced to f = 0.250 10³ Hz and the displacement s = 4 s or

I = cte (f s)²

I = constant (0.250 10³ 4)²

I = cte 1 10⁶

the relationship

I / Io = 1

I = Io

I = 0.750 W / m²

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3 years ago

The temperature of the liquid in a container decreases as the liquid evaporates. Use kinetic theory to explain why.

melisa1 [442]

Answer:

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3 years ago

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vfiekz [6]

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3 years ago

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