CE 2221 Engineering Dynamics Question 1: A girl and her 40kg dog are out walking one summer day when they come to a road they need to cross. The pavement is hot, so the girl borrows a skateboard for her dog and gives him a push to get him across the road so that his feet won’t burn. If the road is 10 meters wide, using the EQUATION OF WORK AND ENERGY, find the magnitude of the initial velocity required so that the dog will coast across the road and come to rest at 10 meters away on the other side of the road. The coefficient of kinetic friction between the wheels and the pavement is 0.3. Student ID: Page 2 of 11 Exam 1 Spring 2022 CE 2221 Engineering Dynamics Student ID: Page 3 of 11 Exam 1 Spring 2022 CE 2221 Engineering Dynamics Question 2: The girl and the 40kg dog have a treehouse! To get into the treehouse, the girl uses a winch to raise the dog elevator and then climbs up herself. The elevator is initially at rest on the ground. If the girl can raise the elevator at 0.3 [m/s] after 5 seconds, use the EQUATION OF IMPULSE AND MOMENTUM to find the tensile force in the cable she can impart by turning the winch. You may assume frictionless pulleys and that her force is constant. Student ID: Page 4 of 11 Exam 1 Spring 2022 CE 2221 Engineering Dynamics Student ID: Page 5 of 11 Exam 1 Spring 2022 CE 2221 Engineering Dynamics Question 3: There is an air hockey table in the treehouse! Find the x and y components of the final velocities for both 0.2 [kg] pucks after they collide. e=0.8 Student ID: Page 6 of 11 Exam 1 Spring 2022 CE 2221 Engineering Dynamics Student ID: Page 7 of 11 Exam 1 Spring 2022 CE 2221 Engineering Dynamics Question 4: Label the n-t coordinate axes in the top view of the yoyo travelling in a circle in the horizontal plane. Side View of the Yo-Yo travelling in a circle Student ID: Top View of Yo-Yo travel path Page 8 of 11 Exam 1 Spring 2022 CE 2221 Engineering Dynamics Question 5: Each sled dog can pull with 100 [N] force on ice. If both sled teams start from rest, which team has the greatest final velocity? Consider only the sled masses. Team A: 3 Dogs pulling a 1200kg sled for 11 seconds Team B: 4 Dogs pulling a 1500kg sled for 8 seconds Student ID: Page 9 of 11 Exam 1 Spring 2022 CE 2221 Engineering Dynamics Question 6: Can the coefficient of restitution be equal to 1 in reality? Write 1-2 sentences to explain your answer Student ID: Page 10 of 11 Exam 1 Spring 2022 CE 2221 Engineering Dynamics Question 7: Indicate which of the forces do not perform work on the box and explain why: Student ID: Page 11 of 11 Exam 1 Spring 2022
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