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CBSE Class 11-science Answered

a bullet field at an angle of 30degreeswith the horizontal hits the ground 3 km away.by adjusting
Asked by | 26 Jul, 2009, 12:46: AM
answered-by-expert Expert Answer

WE know, R = u2sin2θ / g 

Therefore the ratio of horizontal ranged R1 and R2 for angle of projections θ 1 and θ 2 is

 R1/ R2 = sin2θ1 / sin2θ2

Therefore, sin2θ2 = R2sin2θ1  / R1

 Here, θ1  = 30o   ,  R1  = 3km , R2 = 5 km

so, sin2θ2 = sin 60o x ( 5/3) = 1.443 ( greater than 1 )

which is not possible .

Therefore, it is not possible to hit the target by adjusting the angle.

Answered by | 26 Jul, 2009, 12:19: PM

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