一道A-Level物理题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 reac
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一道A-Level物理题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 reac
一道A-Level物理题
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 reac
由s=1/2 aT^2 得
加速度a=2m/s^2
又由受力分析,加速度a=gsinθ-μgcosθ
代入,解得
μ=0.339