A Level Physics Questions Topic - Materials

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rezwan10
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#1
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#1
Q1)
A sample of wire has a Young modulus E. A second sample of wire made from an identical
material has three times the length and half the diameter of the first sample.
What is the Young modulus of the second sample of wire in terms of E?


A) 0.25E
B)E
C)6E
D)12E


A steel wire has a cross-sectional area 0.5 mm2
. The Young modulus of steel is 2.0 × 1011 Pa.
Assume the wire obeys Hooke’s law.
What load must be suspended from the wire to produce an extension which is 0.1% of the
original length?

A) 40N
B)50N
C)100N
D)200N
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robertoooo
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#2
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#2
1)D
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rezwan10
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(Original post by robertoooo)
1)D
I know its D but how
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rezwan10
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#4
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(Original post by rezwan10)
I know its D but how
Its not D, its B
Question 2 is C
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robertoooo
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#5
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(Original post by rezwan10)
Its not D, its B
Question 2 is C
It is D, E = (FL)/(A deltaL), L increases by x3, a is 4x smaller because diameter is 2x smaller, A is proportional to diameter^2
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11lightsinthesky
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#6
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(Original post by robertoooo)
It is D, E = (FL)/(A deltaL), L increases by x3, a is 4x smaller because diameter is 2x smaller, A is proportional to diameter^2
No they’re right it is B. The question is asking for the Young’s Modulus of the same material, no matter the measurements if it’s the same material E doesn’t change

And question 2 is C
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