- #1
usamo42j
- 10
- 0
Homework Statement
An angler hangs a 4.50-kg fish from a vertical steel wire and 5*10^-3 cm^2 in cross-section area. The upper end of the wire is securely fastened to a support.
a) Calculate the amount the wire is stretched by the hanging fish.
The angler now applies a force F to the fish, pulling it very slowly downward by 0.500 mm from its equilibrium position.
Calculate
b)Work done by gravity
c) Work done by the force F
d) Work done by the force the wire exerts on the fish
e) Change in elastic potential energy
Homework Equations
Young's modulus = Tensile stress/tensile strain=F/A*l0/Δl
Newton's laws (?)
The Attempt at a Solution
Young's modulus for steel is 20^10 = 4.5g/(5*10^-7)*1.5/Δl and solve for Δl
Then the work done by gravity is 4.5g*0.500/10^3
But it doesn't seem like there is enough information about the forces to answer c) and d)... I tried setting the force equal to the weight, but that didn't work.
Help is appreciated. ~