Question

a)
Fig. Show
extension A
force
i) State whether copper is ductile, brittle
or polymeric material
ii) 1) On Fig, mark with the letter the point one the line beyond
which Hooke's law does not apply.
2)
State how spring constant for the wire may obtained from Fig. gradient
b) A copper wire is fixed at one end and passes over a pulley. A mass hangs from
the free end of the wire as shown in Fig.
2.5 m
6.5°
pointer
copper wire
mass
M
The length of wire between the fixed end and the pulley is 2.5 m. When the mass
on the wire is increased by 6.0 kg, a pointer attached to the pulley rotates through
an angle of 6.50. The pulley, of diameter 3.0 cm, is rough so that the wire does
not slide over it.
For this increase in mass,
1) show that the wire extends by 0.17 cm,
2)
calculate the increase in strain of the wire.
ii) The area of cross-section of the wire is 7.9 x 10-7 m2. Calculate the
increase in stress produced by the increase in load.
iii) Use your answer to (i) 2 and (ii) to determine the Young's modulus of
copper
iv) Suggest how you could check that the elastic limit of the wire is not
exceeded when the extra load is added.​

Answer 1

Answer:

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Explanation:

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