12:35 PM iPad 82% E MasteringPhysics: Assi x Mastering Physics: Hw3 X C session

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12:35 PM iPad 82% E MasteringPhysics: Assi x Mastering Physics: Hw3 X C session masteringphysics.com/ assignmentProblemID 39515791 Physics for Sciences 1 Signed in as charley correa Problem 3.42 previous l 6 of 7 l next Problem 3.42 A61-kg box rests on the floor. The coefficients of static and kinetic friction between the bottom of the box and the fioor are 0.70 and 0.50. respectively. Part A What is the minimum force a person needs to exert on the box to start it sliding? Express your answer to two significant figures and include the appropriate units. Value Units Submi My Answers Give Up Part B After the box starts sliding, the person continues to push it, exerting the same force. What is the acceleration of the box? Express your answer to two significant figures and include the appropriate units. Value Units Submit My Answers Give Up

Explanation / Answer

F min = coeffcicient of static friction* R = 0.7 * 61*9.8 =418.46 N

after sliding

frictional force f= 0.5 * 61 *9.8=298.9 N

acceleration = 418.46 - 298.9 / 61 =1.96m/s^2

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