Question

Chapter D3, Problem D3/167 The baseball is traveling with a horizontal velocity of 81 mi/hr just before impact with the bat. Just after the impact, the velocity of the 5.125-oz ball is 138 mi/hr directed at 30° to the horizontal as shown. Determine the x- and y-components of the average force R exerted by the bat on the baseball during the 0.0065-sec impact. Comment on the treatment of the weight of the baseball (a) during the impact and (b) over the first few seconds after impact. 138 mi/hr 30° 81 mi/hr Answer: R = j) Ib

Answer 1

som: t = 0.0085 see J = -81êmiller v = (138cos 30 i + 138 sin 30 ) milur 5-12502 W- تمد Be-dinni . ko Rxt = m ( Uzey Vsee) R2 = w (vaa - Vox) t 5.125 [13860530 – 1-800) 16x32-2 0.0065 450.06 lb 5280 3600 Rxe = + y = dirne fy = tw t C] ^ ( 13% Sĩ 1 36 , 180, S-las 16x32.2 0.0065 3800 16 = 155.20 lb Py = 155.00 lb 7_17 ng is neglect during imperet and asood Assumption. The queentity my may not be neglected. There for otherwise a record home-ren distance... Ry we obten