Write a brief essay explaining why the efficiency of a complex machine decreases as more simple machines are used. be sure to include a discussion on the conservation of energy in your explanation.

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.