Question

A 70.0kg person on a parachute is descending with a terminal velocity of 8.00m/s. The person tries to avoid leg injury after touch down by crouching down by 60.0cm. Calculate the total stress on leg bones if the effective cross sectional area of bones is 6cm^2.

Assume the breaking stress of the bone is 1.00 x 10^9 dyn.cm^2, and the Young’s Modulus is 14.0 x 10^10 dyn.cm^2.

Note that: 10^2 is the same as 102

Answer 1