Someone says, "When we burn coal, we are using the energy of ancient sunlight." Write a scientific explanation of what this means.

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Explain the consequences of this addiction to the brain tissue