题目

如图所示，在“验证碰撞中的动量守恒”实验中：   (a)用游标卡尺测量直径相同的入射球与被碰球的直径，测量结果如图甲所示，该球直径为____  ____cm．(b)实验中小球的落点情况如图(乙)所示，入射球A与被碰球B的质量比为mA∶mB=3∶2，则实验中碰撞结束时刻两球动量大小之比pA∶pB=_____   ___． 答案：1.45 (4分)；1∶2 (4分)Leeds CastleOne of the most popular places of interest in Britain Opening timesOpen all year round except 7th and 8th November and Christmas Day（25th December）2009．1 April to 30 September 2009Open：10:30 am—5:30 pm Gates close at 6pm1 October 2009 to 31 March 2010 Open：10:30 am—4 pm Gates close at 5pm PricesAdults：￡16.50 Students：￡9.50 Children under 4：free 小题1:Leeds Castle is closed on _________．A．7th JanuaryB．8th AugustC．25th DecemberD．1st April小题2:John and Mary will take their three-year old son to Leeds Castle．How much should they pay?A．￡33． B．￡16.50． C．￡26． D．￡9.50．小题3:What time does Leeds Castle close on 29th October? A．6 pm． B．6:30 pm． C．5:30 pm． D．5 pm．