An object with a mass of #7 kg# is on a ramp at an incline of #pi/12 #. If the object is being pushed up the ramp with a force of # 4 N#, what is the minimum coefficient of static friction needed for the object to remain put?

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Answer 1 · 2016-03-25T14:53:58

#coefficient of static friction=(mgsinpi/12-4)/(mgcospi/12)#

#we have#
#mgsinpi/12-A*mgcospi/12-4=0#
#mgsinpi/12-4=A*mgcospi/12#
#A=(mgsinpi/12-4)/(mgcospi/12)#