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3 years ago

7

What do hydroelectric plants use to generate electrical energy?

2 answers:

Mandarinka [93]3 years ago

5 0

Answer:

A. falling water

Explanation:

I got it right on Edgenuity. Good luck on your quiz.

vekshin13 years ago

4 0

Answer:AC generators

Explanation:

In hydroelectricity as the gate in the dam is open,water flow with great pressure through the penstock,the water hits the turbine,which is connected to an AC generator and the turbine begins to rotate,as the turbine begins to rotate,mechanical energy of the rotating turbine is converted to electrical energy in the AC generator

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The force an ideal spring exerts on an object is given by Fx = -kx, where x measures the displacement of the object from its equ

shusha [124]

Answer:

The work done by this force can be found via the following formula

$W = \int{F(x)} \, dx = \int\limits^0_{-20} {(-kx)} \, dx = \frac{-kx^2}{2}\left \{ {{x=0} \atop {x=-20}} \right. = \frac{-60*(-20)^2}{2} \\W = -12000J$

Explanation:

Alternatively, the work done by the object is equal to the elastic potantial energy done by the spring.

$U = \frac{1}{2}kx_2^2 - \frac{1}{2}kx_1^2 =0 - \frac{1}{2}60(-20)^2 = -12000J$

6 0

3 years ago

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masya89 [10]

125/5 = 25 meters per second

3 0

3 years ago

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The specific heat of water is 4.2 J/g • °C. How much heat is required to raise the temperature of 100 g of water by 5°C? *

Svetach [21]

Answer:

2100 J

Explanation:

The heat required to increase the temperature of a substance is given by

$Q=mC\Delta T$

where

m is the mass of the substance

C is its specific heat capacity

$\Delta T$ is its change in temperature

For the water in this problem, we have:

m = 100 g is its mass

C = 4.2 J/g • °C is the specific heat capacity

$\Delta T=5^{\circ}C$ is the increase in temperature

So, the amount of heat needed is:

$Q=(100)(4.2)(5)=2100 J$

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tester [92]

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Object A and object B are 10 m apart. Which of the following will cause the greatest increase in gravitational force between the

lianna [129]

<span>4)Increase the mass of both object A and object B. </span>

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3 years ago

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