a disc of mass 5kg is kept floating horizontally in mid air by firing 10 bullets per second vertically up.if the mass of each bullet is 50 gm and bullets rebound with same speed the speed of each bullet is?
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Answered by
102
Hey!
is the answer 50m/s??
Hope this helps!
is the answer 50m/s??
Hope this helps!
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pinkspink23:
yes its right.....tysm
no worries!
Answered by
137
Weight of disc = mg = 5 kg × 10 m/s² = 50 N
Force exerted by 10 bullets must be equal to 50 N
F = Δp / t
F = nm × (v - u) / t
F = nm × (v - (v)) / t
F = 2nmv/t
From above
v = Ft / (2nm)
= (50 N × 1 s) / (2 × 10 × 50 × 10^-3 kg)
= 50 m/s
Speed of each bullet is 50 m/s
Force exerted by 10 bullets must be equal to 50 N
F = Δp / t
F = nm × (v - u) / t
F = nm × (v - (v)) / t
F = 2nmv/t
From above
v = Ft / (2nm)
= (50 N × 1 s) / (2 × 10 × 50 × 10^-3 kg)
= 50 m/s
Speed of each bullet is 50 m/s
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