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- physics help,volunteer,a 1-kg of wood is pressed against a vertical wall (µs= 0.25) by a force inclined 40º upward with respect to the vertical axis. determine the maximum force which can start the motion of the block.,the coefficient of friction between the sole of a shoe and a tile span roof is 0.36. what minimum slope of the roof can start slipping?,1.) a 60 kg package rests on the level floor of a warehouse. if the coefficients of static and kinetic frictions are 0.56 and 0.37 respectively,what horizontal pushing force is required to (a) start the package's motion? (b) slide the package across the floor at constant velocity?,a 1340 kg triumph tr-8 traveling north at 43 km/hr crashes head-on into a 1850 kg checker cab moving west at 87 km/hr. the two cars become tangled together. what is their speed a moment after the coll,at what angle are the entangled cars travelling just after their collision?,etc.,north is 90 degrees,a charge of -7 x 10^-8c exerts a force of 0.045n on a ...