PHYS 170 Worksheet 4.1 Student ID Family Name 79135968 Ferguson 59718130 Srivastava 62116076 Nazarli 4636528 Chen 49713258 Bradley Jack jackbrad 4721@gmail.com First Name Email Kieren Kieren.ferguson@icloud.com. Vidith Heredar Stephen Vidith09@gmail.com heydarnazarli 2006@gmail.com Stephenchen2800@Gmail. com 1. Moments in two dimensions, including signs A. Find the moment around point A of i. F. = - 2 (250) Cas 30 =- 433 NM. F1 " 250 N JA 02 2 m- -3 m F2 " 300 N - 60! ii. F2 4 m =- 5 ( 300) Sin Go =- 1299 Nm K -1300 NM iii. F 500 3/3 5 4 =- 1/5 (500)(5) + 3/5(500) (4) = - 800 Nm 5 3 500 B F3 " 500 N B. Find the moment around point B of 1 i. F = 3 (250) cos 30 - 4 (250) Sin 30 = 149.5 Non ~ 150 Nm ii. F2 = 4(300) (cas(.) = 600 Nm iii. F3 =500(0.6) (0) = 0 Nm
2. The A-frame is being hoisted into an upright position by the vertical force of F = 80 lb. Determine the moment of this force about the y axis when the frame is in the position shown. z 80 lb AF C A 39 X¿ 6 ft 15! B 1 6 ft y x y¿ RAC= = F- 6 Cosis 3 6 sinIs F = [: 1 Mi= R x x F = - 463.6 1 COS30 0 240 1 0 wy = 1 - Sin 30 MA. My = 281.5 16 . ft