[physical]

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ممكن حل هذه الأسئلة بالتفصيل الممل والاجابات تجدونها في الأسفل

1- A block of copper is subjected to a uniform pressure of such
magnitude that its density increases by 0.005 percent .Determine the pressure and compare it with that of one atmospere , which ia about 15^5 Pa (^= أس ).



2- An aluminum wire and an iron wire of identical dimeters are joined end to end .what should be the ratio of their lengths so that both segments elongate by the same amount under a given load to the composite wire ?



3- The distance between the fixed post and the tuning peg on a piano in its midregister is 1.25m .A steel wire of 0.6 mm diameter is attached to the post and wound about the peg. The diameter of the peg is 6.00 mm .If initially the tension in the wire is negligibly small , how much must the peg be turned to place the wire under a tension of 250 N ?



4- A 1.2 Kg brass sphere is rotated in a vertical plane at the end of 1.000 m long steel wire of 1.00 mm diameter. when the brass sphere is at its highest point , the tension in the wire is 22 N .Calculate the tensile stress and the lenght of the wire when the sphere is at the bottom of the circle .

ومشكوريين مقدما

The answers :
1- 2.728 × 10^3 atm
2- (LFe / LAl ) = 2.86
3- 106ْ ( ْ = درجه )
4- 1.18 × 10^8 N/m^2 , 1,001 m

[physical]

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