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Engineering Mechanics

Engineering Mechanics
The time of flight (t) of a projectile on a horizontal plane is given by

t = 2u. sinα/g
t = 2u/g.sinα
t = 2u. tanα/g
t = 2u. cosα/g

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Engineering Mechanics
In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is

100
50
400
200

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Engineering Mechanics
The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as

None of these
Principle of independence of forces
Principle of transmissibility of forces
Principle of resolution of forces

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Engineering Mechanics
The centre of gravity of a uniform lamina lies at

The bottom surface
The centre of heavy portion
The midpoint of its axis
All of these

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Engineering Mechanics
Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the balls with velocity ‘v’ is made to strike the second ball. Both the balls after impact will move with a velocity

v/4
v
v/2
v/8

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Engineering Mechanics
The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)

P = mW + C
P = mW - C
P = m/W + C
P = C - mW

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