What is the mass in kg of a person who weighs 185 pounds?

1 Answer
Jul 24, 2016

Answer:

#"185 lb"~~"84.2 kg"#

Explanation:

This question can be answered by using dimensional analysis.

The relationship between kilograms and pounds is #"1 kg=2.20 lb"#.

This gives us two conversation factors:

#"1 kg"/"2.20 lb"# and #"2.20 lb"/"1 kg"#

Multiply the given dimension #("185 lb")# by the conversion factor with the desired unit in the numerator. This will cancel the unit we wish to convert.

#185" lb"xx(1" kg")/(2.20" lb")="84.2 kg"# rounded to three significant figures.