一道A-Level物理题(越快越好)A and B are points on the same line of greatest slope of a rough plane inclined at 30° to the horizontal.A is higher up the plane than B and the distance AB is 2.25m.A particle P,of mass m kg,is released from rest
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![一道A-Level物理题(越快越好)A and B are points on the same line of greatest slope of a rough plane inclined at 30° to the horizontal.A is higher up the plane than B and the distance AB is 2.25m.A particle P,of mass m kg,is released from rest](/uploads/image/z/12599738-26-8.jpg?t=%E4%B8%80%E9%81%93A-Level%E7%89%A9%E7%90%86%E9%A2%98%28%E8%B6%8A%E5%BF%AB%E8%B6%8A%E5%A5%BD%29A+and+B+are+points+on+the+same+line+of+greatest+slope+of+a+rough+plane+inclined+at+30%C2%B0+to+the+horizontal.A+is+higher+up+the+plane+than+B+and+the+distance+AB+is+2.25m.A+particle+P%2Cof+mass+m+kg%2Cis+released+from+rest)
一道A-Level物理题(越快越好)A and B are points on the same line of greatest slope of a rough plane inclined at 30° to the horizontal.A is higher up the plane than B and the distance AB is 2.25m.A particle P,of mass m kg,is released from rest
一道A-Level物理题(越快越好)
A and B are points on the same line of greatest slope of a rough plane inclined at 30° to the horizontal.A is higher up the plane than B and the distance AB is 2.25m.A particle P,of mass m kg,is released from rest at A and reaches B 1.5s later.Find the coefficient of friction betweem P and the plane.
一道A-Level物理题(越快越好)A and B are points on the same line of greatest slope of a rough plane inclined at 30° to the horizontal.A is higher up the plane than B and the distance AB is 2.25m.A particle P,of mass m kg,is released from rest
由时间和距离求加速度:1/2at²=d
由加速度求摩擦系数:mgsinθ-mgcosθμ=ma
代入:t=1.5,d=2.25,g=9.8,θ=π/6
解得:
a=2.
μ=0.342