Mechanical Properties of Solid | Young’s Modulus | Part – 2 | Physics | IIT-JEE | KELVIN Institute - Videos

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About the topic: The lecture is about young’s modulus belonging to mechanical properties of solids.The young’s modulus is explained and some numerical problems are also solved.

The graph shows the extension (∆l) of a wire of length 1m suspended from the top of a roof at one end and with a load W connected to the otherend. If the cross sectional area of the wire is 10-6 m2, Calculate the Young’s modulus of the material of the wire

(a) 2 × 1011N / m2
(b) 2 × 10-11N / m2
(c) 2 × 10-12N / m2
(d) 2 × 10-13N / m2
A rod PQ of length 1.05 m having negligible mass is supported at its ends by two wires one steel (wire A), and the other of aluminum (wire B) of equal lengths as shown in Fig. The cross- sectional areas of wires A and B are 1.0 mm2 and 2.0mm2 respectively. At what point along the rod a load W be suspended in order to produce (Ysteel = 200 GPa, Yaluminium = 70 GPa)
(a) Equal stress
(b) equal strains in both steel and aluminium.

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