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Thanks a lot for the replies spinnor, what is it that you are referring to with k btw? is it the Young's Modulus of the materials? concrete E = 10 GPa and mild steel E = 205 GPa Thanks a lot again

Can anybody else offer a solution?

It may be related but I can't deduce anything from it.

Homework Statement Determine the stresses and the change in length of the compound bar. compressive load F = 40kN Length L = 0.25m material (a) mild steel E = 205 GPa material (a) area = 0.04m^2 material (b) concrete E = 10 GPa material (b) area = 0.16m^2 For a similar example see...

The new force and mass are both unknowns, how does this help? I've solved it now, thanks.

Thanks, how is the mass found if the force with the extra mass unknown.

Homework Statement For a birthday gift, you and some friends take a hot-air balloon ride. One friend is late, so the balloon floats a couple of feet off the ground as you wait. Before this person arrives, the combined weight of the basket and people is 1200kg , and the balloon is neutrally...