Engineering Mechanics - Mechanical Engineering Questions and Answers

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In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.

less than

equal to

more than

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The unit of work in S.I. units is

newton

erg

kg-m

joule

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The static friction

bears a constant ratio to the normal reaction between the two surfaces

is independent of the area of contact, between the two surfaces

always acts in a direction, opposite to that in which the body tends to move

all of the above

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The maximum height of a projectile on a horizontal plane, is

\(\frac { u^2 sin^2\alpha } { 2g }\)

\(\frac { u^2 cos^2\alpha } { 2g }\)

\(\frac { u^2 sin^2\alpha } { g }\)

\(\frac { u^2 cos^2\alpha } { g }\)