106_Physics ProblemsTechnical Physics

# 106_Physics ProblemsTechnical Physics - Chapter 4*P4.60(a...

This preview shows page 1. Sign up to view the full content.

Chapter 4 107 *P4.60 (a) We use the approximation mentioned in the problem. The time to travel 200 m horizontally is t x v x == = 200 1000 0200 m ms s , . . The bullet falls by yv t a t yi y =+ = + = 1 2 0 1 2 98 02 0196 2 2 .. . s m 2 ej a f . (b) The telescope axis must point below the barrel axis by θ ° tan . . 1 200 00561 m m . (c) t 50 0 00500 . . m s . The bullet falls by only y =− = 1 2 005 00122 2 . s m 2 a f . 50 150 200 250 barrel axis bullet path scope axis FIG. P4.60(b) At range 50 1 4 200 m m = a f , the scope axis points to a location 1 4 19 6 4 90 cm cm a f = above the barrel axis, so the sharpshooter must aim low by 490 122 368 . cm cm cm −= . (d) t y = 150 0150 1 2 015 0110 2 m s s m 2 . . a f Aim low by 150 200 19 6 11 0 3 68 ... cm cm cm af . (e) t y = 250 0250 1 2 025 0306 2 m s s m 2 . . a f Aim high by 30 6 250 200 19 6 6 cm cm .12 cm . (f), (g) Many marksmen have a hard time believing it, but they should aim low in both cases. As in case (a) above, the time of flight is very nearly 0.200 s and the bullet falls below the barrel axis by 19.6 cm on its way. The
This is the end of the preview. Sign up to access the rest of the document.

## 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 .

Ask a homework question - tutors are online