A human fingernail grows about 1 nanometer per second cehck this claim by how often you trim your nails

Question

This is math word problem on units

Answer 1

1 nanometer = 10^-9 meters

Let's see how much a nail grows in 1 week

1 week x 7 days/week x 24 hr/day x 60 min/hr x 60 sec/min x 1 nanometers/second x 1 m/10^-9 nm  = ~6.05x10^-4 meters

So, how many inches is that?

There are 39.37 inches in 1 meter

6.05x10^-4 meters x 39.37 inches/meter = 0.02 inches in 1 week

In cm, that would be about 0.02 inches x 2.54 cm/inch = 0.05 cm/week