What fraction of a piece of iron will be submerged when it floats in mercury?

So this gives us the fraction submerged: the amount of iron within the mercury divided by the total volume of the mercury piece. So that's 7.8 times 10 to the 3 kilograms per cubic meter—density of iron— divided by 13.6 times 10 to the 3 kilogram's per cubic meter—density of mercury— which is 0.57

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.

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