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welcome to candle academy Pakistan.this is lecture 17 of chapter 16 Physics of solids class 12 Physics Federal board and all kpk boards. in this lecture we have solved exercise numerical problems 16.4, 16.5 and 16.6.

00:33 Problem 16.4
cable has an unstretched length of 12 metres and is stretched by 1.2 × 10^- 4 metres when a stress of 6.4× 10 ^ 8 Newton per metre square is applied.what is the strain energy per unit volume in the cable when this stress is applied?

03:57 Problem 16.5
Young's modulus for a particular wood is 1×10 ^ 10 Newton per metre square. Wooden chair has four legs each of length 42 cm and cross sectional area 2×10^-3 metre square. Hamza has a mass of 100 kg.
a. What is the stress on each leg of the chair when Hamza stands on the chair?
b. By what amount do the chair legs shrink when Hamza stands on the chair?

12:00 Problem 16.6
a force of 1.5 ×10 ^4 Newtons cause a strain of 1.4 × 10 ^-4 in a steel cable of cross sectional area 4.8 × 10 ^- 4 meter square.
a. What is the young modulus of the steel cable?
b. The stress strain graph is linear for this cable.calculate strain energy per unit volume stored in the cable when cable has a strain of 1× 10 ^- 4.


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