SSC JE Mechanical Engineering 2014 Set 1 Paper

Question : 173 of 200

Marks: +1, -0

Pressure force on the 15 cm diameter headlight of an automobile travelling at 0.25 m/s is

Solution:

Pressure force on headlight of an automobile

F_P=C_D\ 1/2\ {ρav^2}

=1×1/2×1.2×π/4(.15)^2×.25

= 6.79 N = 6.8 N (approx)
Let

C_d=1

ρ_\air=1.2

kg/m

^{3}

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