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Physics Problem: Minimum Force to Hold Book Against Wall

Solve a physics problem where a student holds a 2.5kg book against a wall with a 45-degree force at 0.35 friction, finding the minimum required force. Steps outlined with formulas and answer provided in English.

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Physics Problem: Minimum Force to Hold Book Against Wall

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  1. F=?? Angle=45 deg Warm Up Day 35(55) A 2.5 kg physics book is held against a wall by a student who applies a force at a 45 deg angle. What minimum force must he use to hold it still against the wall if the coefficient of static friction is 0.35?

  2. Solution • Sum forces in x and y directions • Fx=Fcos45-N • Fy=Fsin45-mg+Friction • Friction<= msN, use equal for min F Fsin45=mg-friction= Fsin45=mg- msFcos45) F=mg/(sin45+ mscos45)= F=25.7N

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