If energy is conserved why are we worried aout energy crisis?
Conservation of energy is the first law of Thermodynamics. The second law states that entropy doesn't decrease, which is the real problem. It basically means not all energy is equally useful.
We can make a battery, which is a nice organized form of potential energy. We can draw the energy out slowly over time, powering our phone say. Some of that energy is radiated as light or radio waves, but most of it is just radiated as heat. By powering the phone, the energy in the battery has made zillions of glass and metal and air molecules around the phone move a bit faster.
Energy is conserved. Theoretically the sequence is reversible; some energy from the molecules in the air could jump into the phone and charge up the battery. But the second law of Thermodynamics, as well as bitter experience, tells us that kind of stuff doesn't usually happen.
So that heat isn't really lost energy, but it's distributed throughout the air in a way that's not recoverable. We need the energy concentrated to use it; diffused as heat it's not as useful.
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While energy itself is conserved according to the principles of physics, the concern over an energy crisis arises from the limitations in the availability and distribution of usable energy resources. Energy conservation refers to the principle that energy cannot be created or destroyed, only transformed from one form to another. However, the Earth's finite reserves of fossil fuels, which have historically been the primary source of energy for human activities, are being depleted at an unsustainable rate. Additionally, the extraction and consumption of these fossil fuels contribute to environmental degradation and climate change.
Furthermore, the distribution of energy resources is not uniform globally, leading to disparities in access to reliable and affordable energy sources. Many regions of the world rely heavily on imported fossil fuels, making them vulnerable to supply disruptions and price fluctuations. Moreover, the transition to renewable energy sources, such as solar, wind, and hydropower, presents its own set of challenges, including technological limitations, infrastructure development, and economic considerations.
In summary, while the conservation of energy remains a fundamental principle, the concern over an energy crisis stems from the finite nature of fossil fuel reserves, environmental impacts associated with their use, and challenges in transitioning to sustainable and equitable energy systems. Addressing these concerns requires a concerted effort to promote energy efficiency, invest in renewable energy technologies, and develop policies that ensure equitable access to clean and affordable energy sources.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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