Ch 5 Practice 1. You place 4kg of rotten food and fruit flies into an orange box that has 7 holes in the side of it to allow air to pass through. The smell is really bad but thankfully there is a breeze at 14.5m/s coming from the west. The box will not break unless you apply more than 90N of force. This box is resting upon your friends head who has a mass of 87 kg. With how much acceleration can you lift this box off his his head without it breaking through and splattering all over him? 2. 2. You have a 2.6m tall sasquatch, who weights 687 N, tied to a rope that can only withstand 190N of force before breaking. Unfortunately he sees 6 bags of beef jerky and wants it. When he applies 300N of force running towards the bag, what must you do to try and slow him down without him getting away? 3. 3. You see a 1500 kg helicopter and decide that you'd like to try and fly it. You have a mass of 65kg and you try to convince your pets to join you. They are rabbit (3kg), meerkat (1.5kg), cat (5kg), dog (8kg), and mongoose(4.5 kg). They all join you for the ride except for cat because he is a scaredy cat. You let meerkat fly the helicopter and he is able to keep it hovering in the air at the same location. What force are the blades applying to the air to stay up? 4. 4. What force does Superman place on the air beneath him in order to accelerate upwards at 87m/s2. His mass is 105kg. 5. 5. You have an atwood machine with zero friction and you can neglect air resistance. You place a 6 kg mass on one side and a 4 kg mass on the other. a. What is the net force on the system? b. what is the acceleration on the system? c. what is the acceleration on the 6kg mass? d. what is the acceleration on the 4kg mass? e. what is the tension force on the 6 kg mass? f. what is the tension force on the 4 kg mass?
