In Example 14.3, we found that one of the steel cables supporting an airplane at the Udvar-Hazy Center was under a tension of 9.30 103 N. Assume the cable has a diameter of 2.30 era and an initial length of 8.00 m before the plane is suspended on the cable. How much longer is the cable when the plane is suspended on it?

Review. A wire of length L, Youngs modulus Y, and cross-sectional area A is stretched elastically by an amount L. By Hookes law, the restoring force is kL. (a) Show that k = YA/L. (b) Show that the work done in stretching the wire by an amount L is W=12YA(L)2/L.

A steel cable 2.00 m in length and with cross-sectional radius 0.350 mm is used to suspend from the ceiling a 10.0-kg model aircraft that is flying in a horizontal circle with an angular speed of 6.00 rad/s. What is the strain produced in the cable?

Orb Spiders make silk with a typical diameter of 0.15mm. 1)A typical orb spider has a mass of 0.50 g. If the spider suspended so from a single 12 cm long strand of self, by how much will the self stretch? 2)What is the maximum weight that a single strand of silk and support? 3)why do you have to lean forward when standing from a chair?

QUESTION 14 A force stretches a wire by 4.0 mm. A third wire of the same material has the same length and twice the diameter as the first. How far will it be stretched by the same force? 4.0 mm 16 mm 1.0 mm 2.0 mm 8.0 mm

Part 1. A force stretches a (first) wire by 2mm. This wire is made of an unknown materialand has a 1.2cm diameter and 3.5cm length. A second wire of the same material has thesame cross section and three times the length. How far will it be stretched by the sameforce?A) 0.33mmB) 0.50mmC) 2.00mmD) 6.00mmPart 2. A third wire of the same material has the same length but four times the diameteras the first. How far will it be stretched by the same force?A) 0.062mmB) 0.125mmC) 1.250mmD) 2.000mmPart 3. The 1st wire is replaced by a muscle bundle of same dimensions. It is pulled by theforce at a negligibly slow stretching speed. What is the muscle tension force?A) 200,000NB) 86.5NC) 22.6ND) 0.00NPart 4. A muscle bundle has the same cross section and four times the length of thebundle of Part 3. It is pulled by the force at a negligibly slow stretching speed. What isthe muscle tension force?A) 200,000NB) 86.5NC) 22.6ND) 0.00NPart 5. A third muscle has the same length but 1.96 times the diameter…

7- Question 7. The following true stress-strain curve for a carbon nanofiber/epoxy with CaCO3 nanoparticles embedded in the matrix is represented in the figure bellow. Calculate the followings: a) K and n of stress-strain equation o=K ɛ". b) modulus of elasticity. c) toughness. 700 600 500 400 300 200 100 0.5 1 1.5 2 2.5 3 3.5 4 Strain % Stress (MPa)

Example 2. -The elastic limit for steel is 2.48 x 108 Pa. What is the maximum weight that can be supported without exceeding the elastic limit? - The ultimate strength for steel is 4.89 x 108 Pa. What is the maxi- mum weight that can be supported without breaking the wire? L ALT A A F

A steel wire of diameter 4.72 mm stretches by 7.98 mm when a 320 -kg piece of equipment is suspended from it. If the wire had a diameter of 4.75 mm instead, by what distance in mm would the equipment stretch the wire?