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Strength of Materials

Strength of Materials
Tangent of angle of friction is equal to

limiting friction
kinetic friction
angle of repose
coefficient of friction

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Strength of Materials
The effort required to lift a load W on a screw jack with helix angle a and angle of friction<="" div="">

Wtan(a + <)>)
Wcos(a + )
Wtan(a-<)>)
Wsin(a + <(>)

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Strength of Materials
A pair of smith’s tongs is an example of the lever of

zeioth order
first order
second order
third order

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Strength of Materials
The unit of work or energy in S.I. units is

pascal
newton
watt
joule

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Strength of Materials
The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be

r/2
r/A
3r/2
2r/3

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Strength of Materials
If n = number of members andy = number of joints, then for a perfect frame, n =

(d)3/-2
j-2
2/-3
(b)2j-l

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