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N = normal force
n = Internal virtual normal force
Δ = Displacement of joints by real loads
L = length of a member
A = cross-sectional area of member
E = modulus of elasticity of a member
What will be the value of Δ in a member:-
  • a)
    Σ 1⁄4 nNL/AE
  • b)
    Σ 1⁄3 nNL/AE
  • c)
    Σ 1⁄2 nNL/AE
  • d)
    Σ nNL/AE
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
N = normal forcen = Internal virtual normal forceΔ = Displacemen...
Answer: d
Explanation: Just substituting the earlier equation in the main equation, we can get it.
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Most Upvoted Answer
N = normal forcen = Internal virtual normal forceΔ = Displacemen...
The normal force (N) is the force that is perpendicular to the surface of contact between two objects. It is the force that prevents two objects from passing through each other.

The internal virtual normal force (n) is a theoretical force that is used in calculations in mechanics. It is the normal force that would exist if the two objects were in contact with each other, but there is no actual physical contact. This is used in situations where the objects are separated by a small distance, such as in the analysis of fluids or gases.

In summary, N is the actual normal force that exists between two objects in contact, while n is a theoretical normal force used in calculations when there is no actual physical contact between the objects.
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N = normal forcen = Internal virtual normal forceΔ = Displacement of joints by real loadsL = length of a memberA = cross-sectional area of memberE = modulus of elasticity of a memberWhat will be the value of Δ in a member:-a)Σ1⁄4nNL/AEb)Σ1⁄3nNL/AEc)Σ1⁄2nNL/AEd)Σ nNL/AECorrect answer is option 'D'. Can you explain this answer?
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