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a E d opera File Edit View History Bookmarks Window Help 10% C4 Fri 12:14 AM Agnes C Chegg study l G e C Chegg s C Chegg C Chegg C Chegg s C Chegg C Preview C Chegg s D Opel C Preview Moran ECE 39 S Dropbo D Four Pol ny Horn .msu.edu For quick access, add your bookmarks to this bar Logout MICHIGAN STATE UNIVERSITY Four Point Course contact US Ques Sample Final Exam 4.5 800 lb us between the refrigerator and the floor is 0.4 and between Michael's shoes and the floor is 0.3. Michael's weight of 160 lb is equally distributed to his right and left feet. Michael is trying to slide the 275 lb refrigerator on the kitchen floor. If Michael's hands are inclined at 20 from the horizontal, calculate the maximum force P that Michael an apply without him sliding. Exper

Explanation / Answer

friction force at Michael's feet

is 2*80*0.4 = 64 lb ---------------------1

Net vrtical reaction at refrigerator = 250- P*SIN20=250-0.342P ----------------------2

horizontal force on  refrigerator = p*cos20 =0.9397P -----------------------3

friction force at refrigerator = u*net normal force = 0.3*(250-0.342P) -------------4

balance horizontal forces

0.3*(250-0.342P) +64 = 0.9397P

139= 1.0423 P

P= 133.36 lb

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