What is the force in member AF A0 B5000N C10000N D15000N Wha

What is the force in member AF?

A)0 B)5,000N C)10,000N D)15,000N

What is reaction at point b?

A)5,000N B)10,000N C)15,000N D)20,000N

5000N 10000 N 6000 N 5 m 10000 N 5 m 5 m

let us take reaction at Point A as R1 and reaction at point B as R2

taking moment at point A = 0

+10000X0+5000X10+10000X5+5000X0-R2X5 = 0

R2 = 20000 N

Hence answer to subpart 2 is D) i.e. 20,000N

Equating total vertical force to zero

R1 +R2-5000-10000-10000 = 0

putting value of R2 = 20000

R1 = 0

by drawing FBD at point A we can see that force in member AF = vertical reaction at point A

hence Force in member AF = 0

answer to first part of question is A) i.e. 0