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 reac 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 一道奇葩的物理题,我选B答案A, 一道物理题,为什么选A level road?原题：The bus turned and rushed along the now --- road and then veered.a.level b.smooth c.even d.horizontal 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. She's got a wonderful job and earns a great __ of money.A deal B quantity C number D level Questions and exercises are given by the computer, which decides ________ to move the students ahead, review an easier level,________ give more work on the same level.A. either; or B. both; andC. whether; or a first-level university degree