Question

Part A Estimate the speed at which your hair grows. Give your answer as the nearest order of magnitude in meters per second. Express your answer to one significant figure. m/ s Submit Previous Answers Request Answer

Answer 1

$\Delta$L = length by which hair grows = 1.25 cm = 1.25 x 10^-2 m

$\Delta$t = time period for the hair to grow = 1 month = 30 days = 30 x 24 h = 30 x 24 x 60 x 60 sec = 2.592 x 10⁶ sec

Speed of growth of the hair is given as

v = $\Delta$L/$\Delta$t

inserting the values

v = 1.25 x 10^-2 /(2.592 x 10⁶)

v = 0.48 x 10^-8 m/s

v = 4.8 x 10^-9 m/s

v = 5 x 10^-9 m/s