Apound is approximately 0.45 kilogram. a person weighs 87 kilograms. what is the person’s weight, in pounds, when expressed to the correct number of significant figures?

Explanation: Given 0.45 kg = 1 pound

Thus if 0.45 kg is equal to= 1 pound

87 kg will be equal to=

The number of significant digits in an answer should be equal to the least number of significant digits in any one of the numbers being multiplied, divided etc. Thus the answer should contain 2 significant digits.

Explanation:

A carbon-12 atom has a mass defect of 0.09564 amu. What is its nuclear binding energy? Round to 3 significant figures. x 10 J per carbon-12 atom

First use the formula;

1 amu =934 MeV

therefore 0.09564 will have

934 x 934

= 89.3 MeV