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4 years ago

Select all the potential effects of damming a river.

Physics

2 answers:

Harrizon [31]4 years ago

8 0

Many people are in favor of the dam. Hydroelectric power is not as polluting

as other forms of electrical generation. The country is growing quickly, and

its economy is growing. The country must be able to produce more electricity

to meet everyone's needs. However, those opposed say the dams will force

many out of their homes. It will destroy an important wilderness area, and may

damage ecosystems - especially river or fjord ecosystems in Patagonia, since

silt won't be carried down rivers. Many also say that the project helps the

copper mining industry, and they believe that this project will benefit

businesses, not the people of Chile

Zina [86]4 years ago

3 0

I would say that A, B, & E are the answers

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Olenka [21]

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3 years ago

Why does it seem that the Sun is rising and setting in the sky?

Anna [14]

B when is spins it means its rotating east and west directions

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3 years ago

The velocity of sound in air at STP (Standard Temperature and Pressure) is approximately 344 m/s. If the frequency of the sound

exis [7]

Answer:

0.066m

Explanation:

use the formula

velocity= frequency × wave length

344m/s = 5200Hz× wavelength

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5 0

3 years ago

You illuminate a slit with a width of 70.3 μm with a light of wavelength 719 nm and observe the resulting diffraction pattern on

Zielflug [23.3K]

Answer:

4.3 cm

Explanation:

We are given that

Width,d=70.3 $\mu m=70.3\times10^{-6} m$

$1\mu m=10^{-6} m$

Wavelength, $\lambda=719 nm=719\times 10^{-9} m$

$1nm=10^{-9} m$

$r=2.11 m$

We have to find the width in cm of the pattern.

The angle for the first minimum m=1

$sin\theta_{min}\approx \theta=\frac{\lambda}{d}=\frac{719\times 10^{-9}}{70.3\times 10^{-6}}=0.0102 rad$

$y=r\theta=2.11\times 0.0102=0.0215 m$

The width of the pattern= $2y=2\times 0.0215=0.043 m=0.043\times 100=4.3 cm$

8 0

3 years ago

A ball is thro.d hit the grouvelocity)?

kati45 [8]

Answer:

The velocity of the ball is 3.52 m/s.

Explanation:

A projectile is any object that moves under the influence of gravity and momentum only. Examples are; a thrown ball, a fired bullet, a kicked ball, thrown javelin, etc.

Given that the ball was thrown vertically upward on the top of a skyscraper of height 61.9 m. So that the velocity can be determined by;

u = $\sqrt{\frac{2H}{g} }$

Where: u is the velocity of the object, H is the height and g is the gravitational force on the object. Given that: H = 61.9 m and g = 10 m/ $s^{2}$ , then;

u = $\sqrt{\frac{2*61.9}{10} }$

= $\sqrt{\frac{123.8}{10} }$

u = 3.5185

The velocity of the ball is 3.52 m/s.

3 0

4 years ago