12 cm4
20 cm4
16 cm4
9 cm4

## Engineering Mechanics The range of projectile (R) on an upward inclined plane is

g. cos² β/2u². sin (α - β). cos α
2u². sin (α + β). cos α/g. cos² β
2u². sin (α - β). cos α/g. cos² β
g. cos² β/2u². sin (α + β). cos α

2mr²/5
2mr²/3
mr²
mr²/2

## Engineering Mechanics A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act

Downward at its upper end
Zero at its upper end
Perpendicular to the wall at its upper end
Upward at its upper end

## Engineering Mechanics In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

P = W tan (α - φ)
P = W cos (α + φ)
P = W tan (φ - α)
P = W tan (α + φ)

## Engineering Mechanics The loss of kinetic energy during inelastic impact, is given by (where m1 = Mass of the first body,m2 = Mass of the second body, and u1 and u2 = Velocities of the first and second bodies respectively.)

[2(m₁ + m₂)/m₁ m₂] (u₁² - u₂²)
[m₁ m₂/2(m₁ + m₂)] (u₁² - u₂²)
[2(m₁ + m₂)/m₁ m₂] (u₁ - u₂)²
[m₁ m₂/2(m₁ + m₂)] (u₁ - u₂)²