What is the mass in kg of a person who weighs 185 pounds?
Risposta:
#"185 lb"~~"84.2 kg"#
Spiegazione:
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"# e #"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.