Two springs, with force constants k1=140N/m and k2=275N/m, are connected in series, as shown in the figure. When a mass m=0.50kg is attached to the springs, what is the amount of stretch, x?

Ex. 78 : A wire of length 2 m and radius 0.1 mm stretched by applying a stress of 3 x 10 N/m2 produces extension of 3 x 10 m. Calculate the strain energy in the wire.

When a 2.90-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 3.02 cm. (a) What is the force constant of the spring? 941.059 v N/m (b) If the 2.90-kg object is removed, how far will the spring stretch if a 1.45-kg block is hung on it? The correct answer is not zero. cm (c) How much work must an external agent do to stretch the same spring 9.50 cm from its unstretched position? 44.70 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. J

In an experiment, when we hung a 500-gram weight at the end of a tensile spring, its length became 20 cm.If we hang a 200-gram weight on the end of this spring, its length will reach 10 cm. Calculate the constant of this spring.