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me244_hw2 - PHGA OneKey dynamics Page 1 of 4 Online...

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Online Homework System Assignment Worksheet 3/2/09 - 5:15 AM Name: ____________________________ Class: dynamics Class #: ____________________________ Section #: ____________________________ Instructor: Koray Safak Assignment: ME244 Homework #2 Question 1: (1 point) The two boxcars and have a weight of 20,000 lb and 30,000 lb, respectively. If they are freely coasting down the incline when the brakes are applied to all the wheels of car determine the force in the coupling between the two cars. The coefficient of friction between the wheels of and the tracks is The wheels of car are free to roll. Neglect thei mass in the calculation. Suggestion: Solve the problem by representing single resultant normal forces acting on and respectively. ____________ lb Question 2: (1 point) Determine the constant speed of the chairs on the amusement park ride if it is observed that the supporting cables are directed at from the vertical. Each chair including its passenger has a mass of 80 kg. Also, what are the components of force in the and directions which a 50-kg passenger exerts on the chair during the motion?
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