ENGR 122 Homework 3 NOTE: Use engineering format for problems 1 through 4. Use non-engineering format for problems 5 through 7. This is an individual assignment. 1. Find the tension in the rope connecting points B and C. 200lbs 2. Find the force at supports A and B for the cylinder shown below. Assume frictionless contact between the cylinder and the supports at A and B. 693.7N 3. A chair lift loaded with three passengers weighs 600 lbs (above right). Determine the forces in the cable to the left and right of the lift. NOTE: You will end up with two equations and two unknowns when you write the equilibrium equations. Use a solve block in Mathcad to solve your equations. 1182 lbs and 1127 lbs 4. A 10 kN roll of paper is supported by a hydraulic turntable as it is transferred from one conveyor to another in a paper mill. The turntable arms that support the roll form a right angle (are 90° apart), and the arm assembly is tilted 20° from the x-axis. Determine the forces at A and B that act on the roll (the roll only contacts the roll handler at points A and B).

100 kg

45° 45°

A B

5. Go to the Parallax web site and find a sensor that you think looks interesting (besides the PING))) sensor, accelerometers, RFID sensors, and GPS sensors). Describe what the sensor measures, some of the key specifications of the sensor, and the sensor cost. 6. Generate bug #3 for your “Bug List.” Remember that a bug can be something that doesn’t work quite right or that could be improved, something that bothers you, or things that you notice others struggling with. For your homework, please name the bug, write up at least a two sentence description of the bug, and provide pictures when it makes sense to do so. You don’t need to try to find a solution to the problem at this point. Try to think of bugs in different categories as you build your bug list. For example, find bugs related to major life activities (recreational, occupational, tasks of daily living, transportation, communication, learning) and bugs affecting special people groups (disabled, senior adults, children). 7. (This problem is due next time) Using the Internet and other sources, learn about ethical dilemmas surrounding biotechnology. Focusing on one or two dilemmas, write up two or three paragraphs describing what you have learned (from ½ to 1 page single spaced); be thinking about the impact that the biotechnology might have on your career. We expect you to spend about one hour completing this problem; this is not meant to be an exhaustive study of the topic.