112_Physics ProblemsTechnical Physics

112_Physics ProblemsTechnical Physics - Chapter 4 *P4.71...

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Chapter 4 113 *P4.71 Find the highest firing angle θ H for which the projectile will clear the mountain peak; this will yield the range of the closest point of bombardment. Next find the lowest firing angle; this will yield the maximum range under these conditions if both H and L are 45 ; x = 2500 m, y = 1800 m, v i = 250 m s. y v tg t v t xv t v t fy i i fx i i =− = == 1 2 1 2 22 sin cos af Thus t x v f i = cos . Substitute into the expression for y f yv x v g x v x gx v fi f i f i f f i F H G I K J sin cos cos tan cos θθ a f 1 2 2 2 2 but 1 1 2 2 cos tan =+ so yx gx v ff f i + tan tan 2 2 2 2 1 ej and 0 2 2 2 2 2 + + gx v x gx v y f i f f i f tan tan . Substitute values, use the quadratic formula and find tan . = 3 905 or 1.197, which gives
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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