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
PHYSICS! A level Modular Questions,Turing Effects(A LEVEL的一道物理题,帮我解答一下,谢)A uniform metal bar is 2.4m long and is suspended from a factory ceiling by a chain at a distance of 60cm from one of the ends. The point at which th
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