Physics, 22.12.2019 14:31 catalanb474

Hydroelectric energy is based on the of water being converted to as water falls and pushes against the turbine.
kinetic; potential
potential; kinetic
chemical; electric
mechanical; chemical

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Hydroelectric energy is based on the potential energy of water being converted to kinetic energy as water falls and pushes against the turbine.

Explanation:

Initially, the water is at the top of its trajectory. At this moment the water possesses gravitational potential energy due to its height relative to the ground. The gravitational potential energy is given by:

U=mgh

where m is the mass of the water, g is the gravitational acceleration, and h is the heigth of the water relative to the ground.

As the water falls, the height h increases, and the gravitational potential energy decreases, being converted into kinetic energy, since the water gains speed. In fact, the kinetic energy is given by

$K=\frac{1}{2}mv^2$

where v is the water's speed. At the bottom of its trajectory, all the gravitational potential energy has been converted into kinetic energy: now the water flows through the turbines, pushing them and making them rotating, and this energy will be converted into electrical energy.

Answer from: Quest

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

Answer from: Quest

The sample with the lowest specific heat capacity will have the greatest temperature increase. in this case, it would be platinum.

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