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Class XI Physics Mechanics of Solid 3
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Question 1
A force F is required to break a wire of length l and radius r. What force is required to break a wire, of same material having twice the length and six times the radius?
Question 2
In a wire stretched by hanging a weight from its end, the elastic potential energy per unit volume in terms of the longitudinal strain σ and modulus of elasticity Y is
Question 3
The following four wires of Length L and radius r are made of the same material. Which of these will have the largest extension, when the same tension is applied?
Question 4
A wire of initial length L and radius r is stretched by a length I. Another wire of same material but with initial length 2I and radius 2r is stretched by a length 2I. The ratio of the stored elastic energy per unit volume in the first and second wire is
Question 5
A material has Poisson’s ratio 0.50. If a uniform rod of it suffers a longitudinal strain of , then the percentage change in volume is
Question 6
The length of a metal wire is L1 when the tension is T1 and L2 when the tension is T2. The unscratched length of the wire is
Question 7
Let L be the length and d be the diameter of cross section of a wire. Wires of the same material with different L and d are subjected to the same tension along the length of the wire. In which of the following cases, the extension of wire will be the maximum?
Question 8
If S is stress and Y is Young's modulus of material of a wire, the energy stored in the wire per unit volume is
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Jun 15JEE & BITSAT