Some kayakers coat the bottom of their kayaks with wax to make them more slippery. kayakers wax their boats to
a. reduce the work output.
b. reduce the weight of the kayak.
c. reduce their input force.
d. reduce the speed the boat travels in water.

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.

explanation:

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.