A 5 tonnes (10000lb) elevator is supported by a stranded cable of 2.5inches square cross section and an effective modulus of elasticity of 12000000psi, As the elevator is descending at a constant speed of 400ft/min. an accident causes the top of the cable ,60ft above the elevator to suddenly stop. Estimate the maximum elongation and maximum tensile stress developed in the cable

Afoot bridge is made as a simple deck, 4 m long, with a cross section 2 m (wide) and 20 cm thick, and made of wood. the deck is supported at the two ends. the maximum load allowable on the bridge is 10 tons, provided it is uniformly distributed on the deck. to sense this load, a strain gauge is placed at the center of the bridge and its resistance is monitored. if the sensor has a nominal resistance of 350 s2 and a gauge factor of 3.6, what is the reading of the strain gauge at maximum load? the modulus of elasticity for the wood used in the construction is 10 gpa.