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Liula [17]
2 years ago
10

In hydroelectric dams, gravitational potential energy is used to produce electrical energy. What is the mass of water that must

fall over a dam that is 12 m high in order to produce the same amount of energy in an AA battery (10,800 J)?
Physics
1 answer:
ddd [48]2 years ago
5 0

What mass of water must fall 12m in order to lose 10,800J of gravitational potential energy ?

Potential energy = (mass) x (gravity) x (height)

10,800J = (mass) x (9.8 m/s²) x (12m)

Mass = (10,800J) / (9.8 m/s² x 12m)

Mass = (10,800 / 9.8 x 12) (Joule-sec²/m²)

(Units:  Joule-sec²/m² = N-m-sec²/m² = (kg-m/s²)-m-sec²/m² = <u><em>kg </em></u>)

<u>Mass = 91.8 kg</u>

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gavmur [86]

Answer:

C a fast-moving cold front moved through the area.

Explanation:

This is because, since there is a there is a thunderstorm and high winds in the area, this can only be caused by a fast moving front. Also there is a temperature drop, this can only be caused by the fast moving cold front since a cold front has a low temperature.

Thus, for the area to experience thunderstorms with high winds and a drop in temperature, <u>a fast-moving cold front moved through the area.</u>

5 0
2 years ago
What is her initial acceleration if she is initially stationary and wearing steel-bladed skates that point in the direction of?
madreJ [45]
We will apply the Newton's second Law so the we will be able to find the acceleration.
F (tot) = ma
a = F(tot) /  m
a = 32.0 N / 65.0 kg = 0.492 m/s^2
Approximately 0.492 m/s^2 is her initial acceleration if she is initially stationary and wearing steel-bladed skates.

7 0
3 years ago
I need help fast! !!!
I am Lyosha [343]
I think it would be at 3 or 6 but I would go with 3 not really sure tho
3 0
2 years ago
1. How far can a person run if they go 6m/s for 15 seconds?
Ray Of Light [21]

Answer:

90m

Explanation:

Speed = <u>distance</u>

Time

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Distance = 6×15

Distance = 90m

4 0
3 years ago
What elements/isotopes are formed via Big Bang Nucleosynthesis?
Natali [406]

Answer:

deuterium, helium and lithium

Explanation:

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Now, the other nuclei formed are usually the elements deuterium, helium and lithium or their corresponding isotopes.

8 0
3 years ago
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