First Law of Thermodynamics — Conservation of Energy
Read this topicExplanations 4
- In 1773, Antoine Lavoisier concluded from his experiments on the mass of reactants and products that matter is never created nor destroyed. By carefully measuring the mass of re…
By Jasper Brown, Alex Federspiel, Gabi Slizewska
- "We are all made of stardust." You may have heard this quote (most famously paraphrased in Carl Sagan's Cosmos) before and wondered how it could be spoken with such certainty. A…
By Adrien, Alex Federspiel, Gabi Slizewska
- (Video) The Law of Conservation of Energy | Forms of Energy by 2 Minute Classroom Did you know that energy around us is constantly shifting between different forms? It might see…
By Mario Janakis, Gabi Slizewska
- Law One of Thermodynamics
By Cassie Gates, Gabi Slizewska
Problems 23
- Climate change is rapidly melting the Arctic sea ice and many people believe that this leads to the rise in sea levels all over the earth. \\ We can look at this effect in a sim…
- In Antarctica, a huge crack is forming in one of the gigantic ice sheets which is floating on the sea. This crack will lead to a chunk the size of Delaware breaking off and beco…
- When you lose weight, where does that mass go?
- When you go for a run, where does most of the energy that you're using go?
- Which has more energy: a ball balanced on the top of a ramp, or the same ball rolling doing the ramp? Ignore friction and air resistance slowing the rolling ball down.
- When swinging on a swingset, when do you have the most energy?
- The total mass of the products of an exothermic reaction should be woah‾\underline{\phantom{woah}}woah the total mass of the reactants.
- Where does the matter in your body come from? Select all that apply.
- When an endothermic reaction absorbs heat, where does the heat energy go to?
- When organic material is combusted, it leaves behind ash. The remaining ash always weighs less than the original material. How is this possible?
- When an exothermic reaction expels heat, where did that energy come from?
- A chemical reaction that generates energy is called woah‾\underline{\phantom{woah}}woah.
- When you are at the top of a hill, you have a high gravitational potential energy. As you log roll down the hill, that energy becomes kinetic. Towards the bottom, however, you s…
- When you plant a seed, it has a tiny mass- somewhere around 5 g. Yet, it quickly begins to grow, and can become a huge plant. Where does it get the majority of this mass?
- What happens to most of the energy of the vibration of a guitar string as it slows down?
- Your friend Arpita bets you that she can make it to the top of the hill in the park before you can, starting in the same place. She takes the long path that goes around the hill…
- On a sunny day you may notice that a blacktop parking lot becomes incredibly hot. Where does this heat come from?
- When light hits a black surface and gets absorbed, what happens to its energy?
- A rocket on the surface of the Earth (PE=−106 JPE=-10^{6}\text{ J}PE=−106 J) blasts into the exosphere (PE=0 JPE=0\text{ J}PE=0 J). The rocket uses 6⋅106 J6\cdot 10^{6} \text{ J…
- If energy is never created nor destroyed, how do we generate energy in power plants?
- In a heat engine (pictured above) a hot fluid is mixed with a cold fluid in order to turn a turbine to produce work. When the temperature of the two wells becomes equilibrated, …
- A common technique used in space travel is the gravitational slingshot. In such a maneuver, a spacecraft can be brought close to a planet or moon, rapidly swung around, and leav…
- An explosion occurs under a 10 N block. The explosion releases 1 kilojoule of energy. Do we expect the block to go less than, more than, or exactly 100 meters?