Calculating Modulus of Elasticity for a Bending Beam with Simple Equation

[Iclaudius]

Hello friends,

so i have this problem:

A beam under test has a measured radius of curvature of 300 m. The bending moment applied to it is 8 Nm. The second moment of area is 8000 mm4. Calculate the modulus of elasticity for the material.

ok so using the engineers bending equation i have,

(M/I)*R = E

using the values stated above i get 300 Pa, answer however is 300 GPa - am i missing something simple? or is this a typo?

Thanks in advance

 

[AlephZero]

Check your units. You proably made a mistake converting mm⁴ into m⁴.

The book's answer is right.