PHYSICS 170 MECHANICS 1: October Exam MARKS This exam counts for a total of 20 marks towards your Final Grade for the course. The exam consists of 2 questions. Each question is worth 20 marks. You are allowed to consult your notes and textbook, but not to communicate with others. NUMERICAL ANSWERS You must write numerical answers correctly to three significant figures and with correct units. CALCULATOR You may use a graphing calculator. Gradescope Upload Please upload your answers to each question separately to gradescope, you are given 20 minutes t There will also be space to upload a copy of your ID as answer to question 3.
Question 1 (20 points The diagram shows a pipe assembly, with the force indicated acting at the point B. The point A coincides with the origin of the coordinate system. A) Draw a clear free body diagram (5 points). B) Calculate the resultant moment acting around point A (5 points). A Z C) Write the unit vector in the direction extending from A to C (5 point). 4 ft y x D) Find the component of the resultant moment around the axis AC (5 points). 3 ft C 2 ft B MF = {4i + 12j - 3k} lb
Question 2 (20 points The diagram depicts a configuration of three cables, as drawn. The force acting on A is 800N. Z 800 N A) Draw a clear Free body diagram for the point A (5 points). D B) Write the unit vectors in the direction of the three forces exerted by the cables (5 points). 4 m 1 5 m C) Write the equations for equilibrium for the point A (5 points). x D) Determine the magnitude of the tension in each of the cables (5 points). A 5 m O -4 m- -3 m C 2 m y 4 m B