A load weighing 10 kg is suspended on a thin wire. In this case, the length of the wire increased
A load weighing 10 kg is suspended on a thin wire. In this case, the length of the wire increased by 0.5 mm. What is the stiffness of the thread?
Given:
m = 10 kilograms is the mass of the load suspended on a thin wire;
dx = 0.5 millimeters = 0.0005 meters – the amount of wire elongation;
g = 9.8 meters per second squared – the acceleration of gravity.
It is required to determine k (Newton / meter) – the stiffness coefficient of the wire.
A body suspended from a wire, acting on the wire with a force equal to the force of gravity:
F gravity = m * g = 10 * 9.8 = 98 Newtons.
Then the stiffness coefficient of the wire will be equal (according to Hooke’s law):
k = F gravity / dx = 98 / 0.0005 = 196000 N / m = 196 kN / m.
Answer: the stiffness factor of the wire is 196 kN / m.