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

来源：学生作业帮助网编辑：六六作业网时间：2024/11/25 14:29:31

一道A-Level物理题(越快越好)AandBarepointsonthesamelineofgreatestslopeofaroughplaneinclinedat30°tothehorizonta

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

A level 一道物理题,为什么选A 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 A-level和O-level是什么? A-Level物理问题 a level是什么什么是A-Level? a level是什么 a level是什么物理题一道,第五题为什麽选a? 一道美国大一声学的物理题挺基础的 For a speaker whose sound power output is 140 dB,the distance from the speaker at which the sound level will be reduced to 96 dB is ___m. a first-level university degree A-level的GCE是什么? A-level物理9702/35 A level生物难么? A level or equivalent certificate A-LEVEL数学讨论群