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makvit [3.9K]
2 years ago
7

What do wind turbines, hydroelectric dams, and ethanol plants have in common?

Physics
2 answers:
AURORKA [14]2 years ago
6 0
Option b is right that is  All use generators to produce electrical current
olasank [31]2 years ago
5 0

Answer: B. All use generators to produce electrical current.

 

Explanation:

The wind, water and ethanol all are the examples of renewable sources of energy. These can be used to generate electricity. The kinetic energy of the blowing wind, free flowing water and liquid like ethanol can be used to generate mechanical energy in the turbine which can help in generating the electricity in the generator.

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A 15g bullet travelling at 100m/s strikes and is absorbed by a 75kg object. Find the speed at which the final object moves.
algol [13]
What i got was
speed of impact that is 44.27 m/s
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time until impact is 4.525
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4 0
2 years ago
If Pete ( mass=90.0kg) weights himself and finds that he weighs 30.0 pounds, how far away from the surface of the earth is he
shutvik [7]

Answer: 9938.8 km

Explanation:

1 pound-force = 4.48 N

30.0 pounds-force = 134.4 N

The force of gravitation between Earth and object on the surface of is given by:

F = \frac{GMm}{R^2} = mg

Where M is the mass of the Earth, m is the mass of the object, R (6371 km) is the radius of the Earth.

At height, h above the surface of the Earth, the weight of the object:

(mg)'= \frac{GMm}{(R+h)^2}

we need to find "h"

taking the ratio of two:

\frac{mg}{(mg)'}=\frac{(R+h)^2}{R^2}\\ \Rightarrow \frac{90kg \times 9.8 m/s^2}{134.4 N}=\frac{(R+h)^2}{R^2}\\ \Rightarrow 6.56 R^2= (R+h)^2 \Rightarrow h= (2.56-1)R\\ \Rightarrow h = 1.56 R = 1.56 \times 6371 km = 9938. 8 km

Hence, Pete would weigh 30 pounds at 9938.8 km above the surface of the Earth.

5 0
2 years ago
Ever tried to stop a 150-pound (68 kg) cannonball fired towards you at 30 mph (48 km/hr.)? No, probably not. But you may have tr
alex41 [277]
The two situations are similar because in both you are trying to minimize the damage and make the best out of a bad situation
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Gold and silicon are mutually insoluble in the solid state and form a eutectic system with a eutectic temperature of 636 k and a
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Yupp its c because my dad farted 
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A carmaker has designed a car that can reach a maximum acceleration of 12 meters/second2. The car’s mass is 1,515 kilograms. Ass
Vlada [557]
1) 15 / 12 = 1.25 ratio
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choose A

6 0
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