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Engineering Mechanics

Engineering Mechanics
The horizontal range of a projectile (R) is given by

R = u² cos2α/g
R = u² sin2α/g
R = u² cosα/g
R = u² sinα/g

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Engineering Mechanics
When the spring of a watch is wound, it will possess

Heat energy
Kinetic energy
Electrical energy
Strain energy

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Engineering Mechanics
Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)

tanα/tan (α + φ)
tan(α - φ)/tanα
tan(α + φ)/tanα
None of these

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Engineering Mechanics
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

Newton's first law of motion
None of these
Newton's third law of motion
Newton's second law of motion

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Engineering Mechanics
A couple produces

None of these
Combined translatory and rotational motion
Translatory motion
Rotational motion

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Engineering Mechanics
If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,

P + m.a = 0
P/m.a = 0
P - m.a = 0
P × m.a = 0

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