The element body force vector fe is given by _____
a) Co-ordinates
b) fe=\(\frac{2Πr̅A_e}{3}\)[f̅r,f̅z,f̅r,f̅z,f̅r,f̅z]T
c) fe=\(\frac{2Πr̅A_e}{3}\)[f̅x,f̅y]T
d) fe=\(\frac{2Πr̅A_e}{3}\)
Answer: b
Explanation: A body force is a force that acts throughout the volume of a body. Forces due to gravity, electric fields and magnetic fields are examples of body forces. Body forces contrast with contact forces or the classical definition of surface forces which are exerted to the surface of an object.
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