1. why is moving water a better source of energy than wind?
2. wind and moving water supply less than of the energy used for running machines in the united states today.
3. wind and moving water can be harnessed with almost no undesirable effects on the .
4. what are the disadvantages of using wind for energy?
5. what are the disadvantages of using moving water for energy?

Question

1. why is moving water a better source of energy than wind?
2. wind and moving water supply less than  of the energy used for running machines in the united states today.
3. wind and moving water can be harnessed with almost no undesirable effects on the .
4. what are the disadvantages of using wind for energy?
5. what are the disadvantages of using moving water for energy?

Accepted Answer

These questions are related to energy sources (wind and moving water) and their characteristics, which falls under the subfield of **Environmental Sciences** (within Natural Science). Here are the answers and explanations for each sub - question:

### Sub - question 1
# Brief Explanations:
Moving water is denser than air. The energy in a fluid is related to its mass and velocity. Since water has a much higher density than air, for the same velocity, moving water has more kinetic energy (using the formula $KE=\frac{1}{2}mv^{2}$, where $m$ is mass and $v$ is velocity). Also, water flow can be more consistent in some cases (e.g., in a river with a steady current) compared to wind, which can be more variable. So, moving water can provide a more concentrated and often more reliable source of energy for conversion (like in hydroelectric power plants) than wind (used in wind turbines).
# Answer:
Moving water is denser than air, so it has more kinetic energy for the same velocity (from $KE = \frac{1}{2}mv^{2}$, higher $m$ for water). Also, water flow can be more consistent, providing a more reliable energy source.

### Sub - question 2
# Brief Explanations:
In the United States, wind and moving water (hydroelectric, etc.) supply less than 10% (this is a general knowledge fact about the energy mix in the US, where fossil fuels and other sources like nuclear are more dominant) of the energy used for running machines (industrial energy use).
# Answer:
10% (approximate, the exact percentage may vary slightly depending on the year and source, but less than 10% is a common approximation for the combined contribution of wind and moving water to industrial energy use in the US)

### Sub - question 3
# Brief Explanations:
When we harness wind (wind turbines) and moving water (hydroelectric dams, etc.), if done properly, they have almost no undesirable effects on the environment (ecosystem, air quality, water quality in a broad sense). For example, wind turbines don't emit greenhouse gases during operation, and well - designed hydroelectric plants can have minimal impact on the surrounding environment (though there can be exceptions, but the question states "almost no").
# Answer:
environment (or ecosystem, as wind and water energy harnessing, when managed well, has little negative impact on the environment/ecosystem)

### Sub - question 4
# Brief Explanations:
- **Intermittency**: Wind is not always blowing. So, wind turbines may not produce electricity when there is no wind, leading to an inconsistent energy supply.
- **Visual and Noise Pollution**: Wind farms can be visually unappealing to some people, and the turbines can produce noise, which may disturb nearby residents or wildlife.
- **Wildlife Impact**: Birds and bats can be killed when they collide with wind turbine blades. Also, the construction of wind farms can disrupt local wildlife habitats.
- **Land Use**: Wind farms require a large amount of land (especially for on - shore wind farms), which can compete with other land uses like agriculture or natural habitats.
# Answer:
- Intermittent (no wind means no power),
- visual/noise pollution (unappealing to some, disturbs wildlife/people),
- wildlife collisions (kills birds/bats),
- land use competition (large land requirements).

### Sub - question 5
# Brief Explanations:
- **Environmental Impact on Ecosystems**: Building dams for hydroelectric power (a common way to harness moving water) can disrupt river ecosystems. It can block fish migration (like salmon in rivers), change the water temperature and flow patterns, and affect the habitats of aquatic organisms.
- **Limited Locations**: Moving water energy (hydroelectric) is limited to areas with suitable water bodies (like rivers with sufficient flow and elevation change). Not all regions have access to such water resources.
- **High Initial Cost**: Building hydroelectric dams or other water - based energy infrastructure is very expensive. It requires large - scale construction, engineering, and often resettlement of people (in the case of large dams).
- **Long - term Environmental Changes**: Dams can lead to sedimentation issues (sediment buildup behind the dam), which can reduce the lifespan of the dam and affect downstream ecosystems that rely on sediment for nutrient cycling.
# Answer:
- Disrupts river ecosystems (blocks fish migration, changes water flow/temperature),
- limited to suitable water - rich locations,
- high initial construction cost,
- sedimentation issues and long - term environmental changes.

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