Question

Convert into si unit
-120nm
-40microgram
-0.4km/h
-0.52km/min

Answer 1

=> Nano means 10 raised to the power minus 9
=> Micro means 10 raised to the power minus 6
=> 1 km / hr =( 5 /18 )m/s
$120nm = 120 \times {10}^{ - 9} meter \\ 40microgram = 40 \times {10}^{ - 6} gram \\ 0.4 \frac{km}{h} = 0.4 \times \frac{5}{18} \frac{m}{s} = \frac{4}{10} \times \frac{5}{18} \frac{m}{s} \\ = \frac{1}{9} \frac{m}{s} = 0.1 \frac{m}{s} \\ \\ 0.52 \frac{km}{min} = \frac{52}{100} \times \frac{1000m}{60s} = \frac{52}{6} \times \frac{m}{s} = 8.6 \frac{m}{s}$