Course Guide Announcements Student Caf Getting Started in Moodle Assignments Overview Assignment 1: Vectors (... Assignment 2: Force (8%) Assignment 3: Energy a... Assignment 4: Circular ... Assignment 5: Thermal ... Assignment 6: Vibration... Units Formula Sheet Unit 1: Mathematical Intr... Total marks for this assignment: 20 Once you have completed Unit 2, please submit Assignment 2 using the assignment submission tool in Moodle so that your Open Learning Faculty Member can grade it and provide you with feedback. It covers material from chapter 4. 1. The mayor of a city decides to fire some city employees because they will not remove the sag from the cables that support the city traffic lights. If you were a lawyer and knew some physics, what defence would you give on behalf of the employees? Who do you think will win the case in court? (1 mark) 2. An 1800 kg helicopter rises with an upward acceleration of 2.0 m/s. What lifting force is supplied by its rotating blades? (1 mark) 3. Two masses shown in the diagram below are connected by a string that passes over a frictionless pulley of negligible mass. The system as shown is released from rest. Assuming the table upon which the 2.5 kg mass is situated is also frictionless, calculate the time taken for the 0.5 kg mass to hit the floor. (4 marks) 2.5 kg 1.2 m 0.5 kg Unit 2: Force Unit 3: Energy and Mom... 4. On takeoff, the combined action of the engines and the wings of an airplane exert a force of 8.00 103 N on the plane upward at + O Course Guide Announcements Student Caf Getting Started in Moodle Assignments Overview Assignment 1: Vectors (... Assignment 2: Force (8%) Assignment 3: Energy a... Assignment 4: Circular ... Assignment 5: Thermal ... Assignment 6: Vibration... 4. On takeoff, the combined action of the engines and the wings of an airplane exert a force of 8.00 103 N on the plane upward at an angle of 65.0 above the horizontal. The plane rises with constant velocity in the vertical direction while continuing to accelerate in the horizontal direction. (3 marks) a. What is the weight of the plane? b. What is the horizontal acceleration of the plane? 5. A boy drags a 100 N sled up a 20 slope at constant velocity. If the coefficient of friction between sled and hill is 0.20, what force must he exert at an angle of 35 with respect to the hill? (4 marks) 6. A box rests on the back of a truck. The coefficient of friction between the box and the surface is 0.32. (3 marks) a. When the truck accelerates forward, what force accelerates the box? b. Find the maximum acceleration the truck can have before the box slides. 7. A 5.0 kg penguin sits on top of a 12 kg sled, as in the figure. A horizontal force of 45 N is applied to the sled, but the penguin keeps himself stationary by holding onto a string attached to the wall. The coefficient of kinetic friction between the penguin and the sled is 0.18, and the coefficient of kinetic friction between the sled and the snow is 0.14. (4 marks) Units Formula Sheet Unit 1: Mathematical Intr... Unit 2: Force Unit 3: Energy and Mom... 45 N P Course Guide Announcements Student Caf Getting Started in Moodle Assignments Overview Assignment 1: Vectors (... Assignment 2: Force (8%) Assignment 3: Energy a... Assignment 4: Circular ... Assignment 5: Thermal ... Assignment 6: Vibration... Units Formula Sheet Unit 1: Mathematical Intr... Unit 2: Force Unit 3: Energy and Mom... b. What is the horizontal acceleration of the plane? 5. A boy drags a 100 N sled up a 20 slope at constant velocity. If the coefficient of friction between sled and hill is 0.20, what force must he exert at an angle of 35 with respect to the hill? (4 marks) 6. A box rests on the back of a truck. The coefficient of friction between the box and the surface is 0.32. (3 marks) a. When the truck accelerates forward, what force accelerates the box? b. Find the maximum acceleration the truck can have before the box slides. 7. A 5.0 kg penguin sits on top of a 12 kg sled, as in the figure. A horizontal force of 45 N is applied to the sled, but the penguin keeps himself stationary by holding onto a string attached to the wall. The coefficient of kinetic friction between the penguin and the sled is 0.18, and the coefficient of kinetic friction between the sled and the snow is 0.14. (4 marks) 45 N a. Draw force diagrams for the penguin and the sled, and identify the reaction force for each force you include. b. Determine the tension in the string. c. Calculate the acceleration of the sled. +0