PHYS 1111 Intro Physics I Mechanics Nguyen Spring 2015 Homework 04 Daniel Hernandez Due date Tue Feb 17 10 59 59 pm 2015 EST Choose whether each of the following statements is true or false Choices True False T An object can be moving in one direction while the net force acting on it is in another direction F In order to move a massive crate sitting on the floor the force you apply to the crate has to overcome the force of the crate pushing back on you F An object at rest has no forces acting on it T An object can be in motion and still have zero net force acting on it You are correct Your receipt no is 156 5120 A bird cage with a parrot inside hangs from a scale The parrot decides to hop from one perch to another without flapping its wings The total weight of the parrot and cage is 50 N For the following questions assume that the scale responds rapidly enough that it gives an accurate reading at every instant What is the reading on the scale before the parrot jumps A 50 N B less than 50 N C more than 50 N You are correct Your receipt no is 156 3609 What is the reading on the scale as the parrot starts its jump A 50 N B less than 50 N C more than 50 N You are correct Your receipt no is 156 904 What is the reading on the scale when the parrot is in the air A 50 N B less than 50 N C more than 50 N You are correct Your receipt no is 156 1900 What is the reading on the scale as the parrot lands on the other perch A 50 N B less than 50 N C more than 50 N You are correct Your receipt no is 156 2414 A 747 jetliner lands and begins to slow to a stop as it moves along the runway If its mass is 3 49E 5 kg its speed is 25 1 m s and the net braking force is 4 22E 5 N what is its speed 7 14 s later 16 5 m s You are correct Your receipt no is 156 8022 How far has it traveled in this time 148 m You are correct Your receipt no is 156 694 When you lift a bowling ball with a force of 75 0 N the ball accelerates upward with an acceleration a If you lift with a force of 84 9 N the ball s acceleration is 1 84a Calculate the weight of the bowling ball 63 2 N You are correct Your receipt no is 156 1063 Calculate the acceleration a 1 84 m s 2 You are correct Your receipt no is 156 5092 Two boxes sit side by side on a smooth horizontal surface The lighter box has a mass of 5 06 kg the heavier box has a mass of 7 48 kg Calculate the contact force between these boxes when a horizontal force of 5 01 N is applied to the light box 2 99 N You are correct Your receipt no is 156 658 Calculate the contact force if the 5 01 N force is applied to the heavy box instead 2 02 N You are correct Your receipt no is 156 8905 A fire helicopter carries a 574 kg bucket of water at the end of a 18 3 m long cable Flying back from a fire at a constant speed of 40 5 m s the cable makes an angle of 45 2o with respect to the vertical Determine the force of air resistance on the bucket 566 N You are correct Your receipt no is 156 964 PHYS 1111 Intro Physics I Mechanics Nguyen Spring 2015 Homework 04 Daniel Hernandez m F c5p24 A 100 kg crate is pushed at constant speed up the frictionless 21 ramp shown in the figure What horizontal force F is required 376 N You are correct Your receipt no is 156 9034 What force is exerted by the ramp on the crate 1050 N You are correct Your receipt no is 156 1613 Printed from LON CAPA MSU Licensed under GNU General Public License
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