PHYS 1111 Intro Physics I Mechanics Nguyen Spring 2015 Homework 05 Daniel Hernandez Due date Fri Feb 27 10 59 59 pm 2015 EST Choose whether each of the following statements is true or false F T F F Choices True False A freight train is accelerating on a level track The tension in the coupling between the engine and the first freight car would change if some of the cargo in the last car were transfered to other cars A freight train is accelerating on a level track The tension in the coupling between the last two freight cars would change if some of the cargo in the last car were transfered to other cars Suppose that the coefficients of static and kinetic friction have values such that s 2 0 k for a crate in contact with a concrete floor This means that the magnitude of the static frictional force acting on the crate at rest is always twice the magnitude of the kinetic frictional force acting on the moving crate Astronauts orbiting the Earth feel weightless because the gravitational attraction of the Earth is so much less at their orbiting altitude You are correct Your receipt no is 156 5690 hrwc6p68 Two masses of 4 00 kg each connected by a string slide down a ramp making an angle of 40 with the horizontal The coefficient of kinetic friction between m1 and the ramp is 0 33 The coefficient of kinetic friction between m2 and the ramp is 0 16 Find the magnitude of the acceleration of the masses m1 m2 4 46 m s 2 You are correct Your receipt no is 156 5751 What is the tension in the string 2 55 N You are correct Your receipt no is 156 7703 hrwc6p21 5e The coefficent of static friction between the floor of a truck and a box resting on it is 0 38 the truck is traveling at 85 8 km h What is the least distance in which the truck can stop and ensure that the box does not slide 76 3 m You are correct Your receipt no is 156 1451 Two blocks stacked one on top of the other slide on a frictionless horizontal surface The surface between the two blocks is rough however with a coefficient of static friction equal to 0 47 The top block has a mass of 3 0 kg and the bottom block s mass is 5 3 kg If a horizontal force F is applied to the bottom block what is the maximum value F can have before the top block begins to slip 38 3 N You are correct Your receipt no is 156 6335 If the mass of the bottom block increases then the maximum value of F A increases B stays the same C decreases You are correct Your receipt no is 156 4007 A block with a mass of 4 55 kg is placed at rest on a surface inclined at an angle of 44 3 above the horizontal The coefficient of static friction between the block and the surface is 0 600 and a force of magnitude F pushes upward on the block parallel to the inclined surface The block will remain at rest only if F is greater than a minimum value Fmin and less than a maximum value Fmax Calculate Fmin 12 N You are correct Your receipt no is 156 1264 Calculate Fmax 50 3 N You are correct Your receipt no is 156 4287 PHYS 1111 Intro Physics I Mechanics Nguyen Spring 2015 Homework 05 Daniel Hernandez Two blocks are connected by a string as shown in the figure below m1 m2 q The smooth inclined surface makes an angle of 43 9 with the horizontal and the block on the incline has a mass of m 1 6 43 kg Calculate the mass of the hanging block that will cause the system to be in equilibrium The pulley is assumed to be ideal 4 46 kg You are correct Your receipt no is 156 783 Printed from LON CAPA MSU Licensed under GNU General Public License
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