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4 years ago

How do we use a dam to generate electricity?

Physics

2 answers:

serg [7]4 years ago

6 0

Answer:

c) Water flowing through an intake pipe causes a turbine to spin.

Explanation:

The production of hydro electrical power can be done when the water passes from the dam to the rivers which are below dam.

The energy is based on the amount or pressure of the water if the more water is passing through the intake pipe then there is more production of energy. An artificial lake is created behind the dam.

Turbines which are surrounded by magnets produce the electricity when the flowing water is hit on the turbines than turbines rotates and produce electricity and turbines are present in the dam.

Therefore, water which is flowing through an intake pipe causes spinning of turbine which produce electricity.

umka2103 [35]4 years ago

4 0

When water from a dam passes through, turbines spin and those turbines generate electricity. This would make C the better answer.

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What organisms apart from algae would have needed to be present to remove carbon dioxide from the early atmosphere??

QveST [7]

Plants in general I think.
photosynthetic organisms.

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4 years ago

A hockey puck is sliding across a frozen pond with an initial speed of 9.5 m/s. It comes to rest after sliding a distance of 37.

Bond [772]

Answer:

<h3>The coefficient of kinetic friction between the puck and the ice is $\mu _{k} =$ 0.12</h3>

Explanation:

Given :

Initial speed $v_{o} = 9.5 \frac{m}{s}$

Displacement $x = 37.4$ m

From the kinematics equation,

$v^{2} - v^{2} _{o} = 2ax$

Where $v^{2} =$ final velocity, in our example it is zero ( $v =0$ ), $a =$ acceleration.

$a =- \frac{90.25}{ 2 \times 37.4}$

$a =- 1.21 \frac{m}{s^{2} }$

From the formula of friction,

$F =- \mu _{k } N$

Minus sign represent friction is oppose the motion

Where $N = mg$ ( normal reaction force )

$ma = -\mu _{k} m g$ ( ∵ $g = 9.8 \frac{m}{s^{2} }$ )

So coefficient of friction,

$\mu_{k} = \frac{1.21}{9.8}$

$\mu_{k} = 0.12$

Therefore, the coefficient of kinetic friction between the puck and the ice is $\mu _{k} =$ 0.12 .

4 0

3 years ago

7. A car travels at 25 m/s to the North. It has an acceleration of 2 m/s to the south

tamaranim1 [39]

Answer:

-0.5 m/s2 as it comes to rest.

Explanation:

7 0

3 years ago

A force of 20. newtons to the left is exerted on a cart for 10. seconds.

myrzilka [38]

OK. Thank you. That's an impulse of 200 Newton-sec to the left,
telling us that the cart's leftward momentum increases by 200 kg-m/s
(or its rightward momentum decreases by that amount).

Did you have a question to ask ?

7 0

3 years ago

How does acceleration due to gravity changes wit depth?

ivann1987 [24]

Decreases

Explanation:

The acceleration due to gravity on a body decreases with depth.

Acceleration due to gravity is the change in velocity with time of a body as result of the pull of gravity or gravitational force.

The acceleration due to gravity tend to pull all bodies to the center of the earth.
As body moves away from the center of the earth, the pull becomes very more and acceleration increase.
But when a body approaches the center of the earth, the acceleration reduces.
At depth, the acceleration due to body of a body begins to decrease.

learn more:

Gravity brainly.com/question/10934170

#learn more brainly.com/question/10934170

#learnwithBrainly

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3 years ago