Think about a construction crane moving a steel beam. Where does the energy used to complete the task come from? What evidence do you have that the amount of energy involved in the crane example is different from that in the wind-up toy example?

11 players on a field that has a maximum of 11 players

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

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