Answer:
atoms atoms atoms atoms atoms
Explanation:
The energy stored in coal is directly form the sun which is solar energy. This energy are preserved in carbon atoms and they originate from the life processes of a plant.
- Plants carry out photosynthesis and produce their energy by this process.
- Green plants have special adapted structures by which they trap solar energy from the sun and use it to produce their own food.
- The food is used by plant for nutrition and life activities.
- In essence the solar energy is converted to chemical energy in plants.
- To form coal, when plants are rapidly buried their organic matter is preserved from decay by combination with oxygen.
- More burial preserves the complex molecules that have stored during photosynthesis.
- The carbon eventually aggregates for coal.
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We can write the law of motion for both trains, calling them train A and train B. Since they both move by uniform motion, so with constant velocity, we can write their position at time t as:
where and are the average speeds of the two trains. For the train B, we put a negative sign, since it is going in the opposite direction.
We want to know the time t after which the distance between the two trains is 50 km. In equations, this means finding the time t after which
And solving, we find:
Which means after 20 minutes.
Answer:
C
Explanation:
Because they both received the same temperature