Numerical Assignments | Chapter 7 | Deformation of Solids | Physics 11th | National Book Foundation

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7.1 The suspension cable to use cable cars at Murree has an unsupported span of 3.25km. Calculate the amount of stretch in the steel cable of diameter of 6cm for its maximum load. The caution on weight is given by the engineers to not more than 𝟒×〖𝟏𝟎〗^𝟔 𝑵.
7.2 Find the strain in your own leg’s while lifting a 50kg box. Relate your finding with the example given above. Do the strain in your leg is greater or lesser than the strain in above case? Explain the reason.
7.3. Calculate the work done in stretching a wire of length 5m having cross-sectional area 𝟏𝒎𝒎^𝟐. When the force applied by you on the edges of wire produces change in the length of wire by 𝟏𝒎𝒎. Young’s modulus of the wire is 𝟐×〖𝟏𝟎〗^𝟏𝟏 𝑷𝒂.

Q. Encircle the correct option.
Glue is an example of __________ solid.
(a) crystalline (b) amorphous (c) poly-crystalline (d) ductile
Which of the following properties is generally exhibited by amorphous solids?
(a) anisotropy (b) glass-transition (c) orderliness (d) geometry
Silicon is found in nature, in the forms of:
(a) SC structure (b) BCC structure (c) FCC structure (d) network structure
One end of a uniform wire of length ‘L’ and of weight ‘W’ is attached rigidly to a point in the roof and a weight ‘W_1’ is suspended from its lower end. If ‘S’ is the area of cross-section of the wire, the stress in the wire at a height ‘3L/4’ from its lower end is:
(a) W_1/S (b) W_1+(W/4)/S (c) W_1+(3W/4)/S (d) (W_1+W)/S
On suspending a weight ‘mg’, the length ‘l’ of an elastic wire having area of cross-section ‘A’ becomes double of the initial length. The instantaneous stress on the wire is:
(a) mg/2A (b) mg/A (c) 2mg/A (d) 4mg/A
The diameter of a brass rod is 4mm and Young’s modulus of brass is 10×〖10〗^10 N/m^2. The force required to stretch by 0.1% of its length is:
(a) 36π N (b) 40π N (c) 360π N (d) 400π N
Why most of the solids refer to be in the crystalline state? What is glass transition in amorphous solids?
Why the window glasses of old building show milky appearance with time?
In the elastic body, which one is more fundamental, the stress or the strain? Explain.
Can tensile stress produce volumetric strain? Explain.
The slope of the force-extension graph represents which quantity? Explain.
Is strain energy always positive or it may be negative? Justify your answer.
On which types of loads the strain energy depends? Explain.
Why suspension bridges are written with their period of use? Why after that period it is dangerous to use the bridge?
If we want to break a wire, why we use repeated bending? How does it effect?
What is the significance of modulus of elasticity?
Define and explain the three types of solids, crystalline, poly-crystalline and amorphous solids.
Define and explain the unit cell and its types. Also define crystal lattice.
Explain stress, strain and modulus of elasticity.
Explain the stress-strain curve for a ductile material.
Explain the plastic and elastic deformation.
Find the area under the force-extension curve is equal to the work.
Find a relation for the elastic potential energy of a material.
Calculate the mass of picture frame hanging from a steel nail (Y_s=20×〖10〗^10 Pa), which is sufficient to produce a force providing shear strain, as shown in figure here. Given that the nail bends only 1.80μm. Also discuss the result.
A 5m long aluminum wire (Y_A=7×〖10〗^10 Pa) of diameter 3mm, supports a 40kg mass. To have same elongation in a copper wire (Y_C=12×〖10〗^10 Pa) of the same length under the same weight, find the diameter of copper wire.
A 4kg mass is hanging with the help of a 1.5m long steel wire (Y_S=20×〖10〗^10 Pa) another mass of 6kg is hanging to the 4kg mass with the help of 1m long brass wire (Y_B=1.0×〖10〗^10 Pa). Both wires have diameter 0.25cm. Calculate the total elongation in the whole system of wires, also calculate the total strain energy.
A rod of 90mm^2 has length of 3m. If a stress of 300MPa is applied to stretch the rod, then find the strain energy if Young’s modulus of the rod is 200GPa.
7.1 A Masjid’s minar having area cross-section 𝟎.𝟐𝒎^𝟐, the upper dome’s weight 10,000N, is made up of a material, with Young’s modulus of 𝟒.𝟓×〖𝟏𝟎〗^𝟏𝟎 𝑷𝒂 and mass density of 𝟐𝟕𝟎𝟎𝒌𝒈/𝒎^𝟑. Find the compressive stress at the cross-section located 3.0m below the top of the pillar and value of compressive strain of the top 3.0m segment of the pillar.
7.2 Calculate the change in length of the upper leg bone of a soccer player, having mass of 70.0kg, supports 62.0kg of his mass on this bone, assuming the bone to be equivalent to a uniform rod that is 40.0cm long and having radius of 2.00cm7.3 Calculate the strain energy stored in a 1m long steel wire connected to the roof, holding a chandelier of weight 980N in the main lounge of your home. The diameter of steel sire is 0.004m and the Young’s modulus of steel is 𝟐𝟎.𝟎×〖𝟏𝟎〗^𝟏𝟎 𝑵𝒎^𝟐.

[UmairUmair-tf]

Please! Upload numericals of this chapter

[studyalltime-plwl]

Subscribe box Kay upper formula nahi nazer aa Raha ....

[AyeshaAhmad-rq]

Sir in assignment 7.2 we have to relate it with example 7.2 but you are relating it with assignment 7.1 so it's solution will get wrong. It's solution will be different if we relate it with example 7.2. please tell me about it. Thank you.

[Osamajutt-wixy]

Question 2 is to be related with example not with first assignment sir

[abdullahnazir-lpos]

plz sir numericals bhi send kar
dayn ..

[ARahimAbbasi]

The ans of last ih wrong it's not 20 it's 0.02

[ImranYousaf-hx]

unit 7 ke numerical problems ki bi video bana de