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1、中考物理模拟试题14 一、选择题(每题 3 分,共 30 分)(黄冈)1“呼麦”是蒙古族的一种高超演唱形式演唱者运用技巧,使气息猛烈冲击声带,形成低音,在此基础上调节口腔共鸣,形成高音,实现罕见的一人同时唱出高音和低音的现象下列说法正确的是A“呼麦”中高音、低音指声音的响度 B“呼麦”中的声音是振动产生的C“呼麦”中高音是超声波、低音是次声波 D“呼麦”中高音和低音在空气中的传播速度不等答案:B(镇江)2如图所示,现代汽车除了前、后排座位都有安全带外,还安装有安全气囊系统,这主要是为了减轻下列哪种情况出现时,可能对人身造成的伤害A汽车速度太慢 B汽车转弯C汽车突然启动 D汽车前端发生严重撞击答
2、案:D 3(2012,镇江,2 分)“墙角数枝梅,凌寒独自开,遥知不是雪,为有暗香来”诗人在远处就能闻到淡淡梅花香味的原因是 A 分子间有引力 B分子间有斥力 C 分子在不停地做无规则运动 D分子很小(黄冈)4如图所示是使用简单机械匀速提升同一物体的四种方式(不计机械自重和摩擦),其中所需动力最小的是答案:D(苏州)5某种材料制成的空心球漂浮在甲液体的液面上,但沉于乙液体中利用这个信息可得 A该材料的密度一定小于甲液体的密度 B该材料的密度一定大于乙液体的密度 C该材料的密度一定等于甲液体的密度 D该材料的密度一定等于乙液体的密度答案:B(武汉)6下列实验中能探究“什么情况下磁可以生电”的是(
3、)答案:B 7(2012 湖北宜昌,9 题)“3G 时代”的到来,可以使用3G手机随时通过无线网络上网。手机无线上网时,是A 利用电磁波传输的数字信号B利用电磁波传输的模拟信号C 利用超声波传输的数字信号D利用红外线传输的模拟信号(贵港)8下列物态变化中,属于凝固现象的是()A初春,冰雪融化汇成溪流 B仲夏,刚从冰箱拿出的冰棍冒“白气”C深秋,学校操场的小草上有露水 D严冬,湖水结成冰答案:D 9(2012 江苏扬州,5)如图所示,在光屏上恰能看到一清晰的像,则像的性质是A.倒立缩小的实像 B.正立放大的虚像C.倒立放大的实像 D.正立缩小的虚像答案:C 10(2012 四川广安,卷I14)在
4、如图 8 所示的电路中,电源电压保持不变,当开关S由断开到闭合,电流表两次示数之比是15。闭合 S后,1R与2R的阻值之比和电功率之比分别是()A、41;1 4 B、14;41 C、15;51 D、51;15 答案:A 二、填空题11.(2012 年广东省,8 题)在铝、铜、硅、塑料等材料中,属于绝缘体的是;20 世纪初,科学家发现,铝在271.76 以下时,电阻就变成了,这种现象称为超导现象;纳米(nm)是单位。中.考.资.源.网答案:塑料、0、长度。(咸宁)12如图 7 所示,“马踏飞 燕”是汉代艺术家高度智慧、丰富想象、浪漫主义精神和高超艺术的结晶。飞奔的骏马之所以能用一只蹄稳稳地踏在飞
5、燕上,是因为马的位置的竖直线能通过飞燕。有一“马踏飞燕”工艺品采用密度为8.0 103kg/m3的合金材料制造,总体积为1dm3,飞燕与水 平桌面的接触 面积为20cm2,则 该工 艺品 的质量 为_kg,对水平桌面的压强为 Pa。答案:图 7 文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A1
6、0J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9
7、S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X
8、7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A1
9、0J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9
10、S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X
11、7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A1
12、0J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2重心 8 410413、(高州市)将两个定值电阻R1与 R2以某种形式连接入某段电路中,R1消耗功率为12W,如果以另一种形式接入原电路得该电路的总电流为9A,此时,R1消耗功率为10W,则R1=_,R2=_.答案:3,614(201
13、2江苏泰州,23)小华发现家里电能表的示数在3h 内由变成了,则他家在这段时间用电 Kwh,用电器消耗的实际功率是W。如果电能表上标有“220v 2.5(10)A”字样,则电路中(选填“能”或“不能”)再接入一个额定功率为800W的电饭煲。答案:1.2 400 不能三、作图与实验题15(2012 年浙江衢州 29)如图所示为钓鱼竿钓鱼的示意图,O 为支点,F1表示手对钓鱼竿的作用力,请完成下列问:(1)在图中画出鱼线对钓鱼竿拉力F2的力臂l2;(2)钓鱼竿属于杠杆 (选填“省力”、“费力”或“等臂”)。答案:29(1)(见下图所示)(2)费力16(2012 四川成都,A卷 23(1)标出图中通
14、电螺线管的小磁针(静止)的南北极(用“S”和“N”表示)。文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文
15、档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5
16、 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10
17、W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文
18、档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5
19、 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10
20、W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文
21、档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2答案:如图 (1)(2分)螺线管画正确得1 分,磁针画正确得1 分。17(2012 安徽芜湖,22)境自远尘皆入咏,物含妙理总堪寻!物理规律往往隐藏在众多表象的茫茫迷雾之中,而科学研(探)究就像穿透这迷雾的明灯,引导着探索者到达真理的彼岸。人类对“运动和力的关系”的认识就经历了一个曲折漫长的探索过程。(1)古希腊哲学家亚里士多德认为:_,这一根据生活经验和事物表象得出的错误观点被人们沿用了近2000 年。(2)十七世纪
22、,伽利略通过理想斜面实验,正确地揭示了“运动和力的关系”。如图所示,伽利略的斜面实验有如下步骤:减小二个斜面的倾角,小球在这个斜面上仍然要达到原来的高度。两个对接的斜面,让小球沿一个斜面从静止滚下,小球将滚上另一个斜面。如果没有摩擦,小球将上升到原来释放时的高度。继续减小二个斜面的倾角,最后使它成水平面,小球将沿水平面以恒定速度持续运动下去。上述步骤中,有的属于可靠事实,有的则是科学推论。将这些事实和推论进行分类排序,以下正确的是()A事实事实推论推论 B事实推论推论推论C事实推论推论推论 D事实推论推论推论(3)伽利略得出:运动物体如果不受其它物体的作用,将会_,伽利略由此开创了实验和推理相
23、结合的科学研究方法。答案:(1)力是维持物体运动状态的原因(2)D(3)永远匀速运动下去文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5
24、 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10
25、W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文
26、档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5
27、 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10
28、W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文
29、档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5
30、 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2(济宁).7、某实验小组探究影响滑轮组机械效率的因素的实验装置如图7 所示,实验数据如下表。若不计摩擦,比较1 和 2 两次的实验数据,可以看出滑轮组的机械效率与有关;比较1 和 3 两次的实验数据,可以看出滑轮组的机械效率与有关。答案:.动滑轮的个数(或动滑轮的总重)提升的物重18.(龙岩市)在温度一定的条件下,做“研究决定导体电阻大小因素”的实验,采用了控制变量的方法。下表给出了实验中
31、所用到的导体的情况。选择C、F 两根导体进行对比,是为了研究导体电阻大小与 _ 是否有关;选择C 和_两根导体进行对比,是为了研究导体电阻与长度的关系;为了研究导体电阻与横截面积的关系,应选择的两根导体是_。(填写导体的代号)导体代号A B C D E F G 长度(m)1.0 0.5 1.5 1.0 1.2 1.5 0.5 横截面积(mm2)3.2 0.8 1.2 0.8 1.2 1.2 1.2 材料锰铜钨镍铬丝锰铜钨锰铜镍铬丝图 7 文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ
32、1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7
33、HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码
34、:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ
35、1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7
36、HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码
37、:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ
38、1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2四、简答与计算19(2012 年福建省
39、福州 22)作为宜居城市,福州近年来大力整治西湖、左海、内河,新建了琴亭湖,全力打造一个美丽的水城,较好地调节了福州市区的气温。请你用所学知识解释修建人工湖和内河可以调节气温的主要原因。答案:根据Q=cm t,由于水的比热容比沙石、泥土的比热容大,在质量、吸收或放出热量基本相同时,水的温度变化较小。这样,福州修建了人工湖和内河可以较好地调节市区的气温。20(2012 浙江杭州,5)人类的祖先钻木取火,为人类文明揭开了新的一页。钻木取火的一种方法如图所示,将削尖的木棒伸到木板的洞里,用力压住木棒来回拉动钻弓。木棒在木板的洞里转动时,板与棒互相摩擦,机械能转化为内能,而热集中在洞内,不易散发,提高
40、了木棒尖端的温度,当达到约260时木棒便开始燃烧。因木头是热的不良导体,故受热厚度很薄,木棒受热部分的质量只有0.25 克。已知:来回拉一次钻弓需1.0 秒,弓长为 s=0.25米,人拉弓的力为16 牛顿,木头比热c=2103焦/(千克),室温为20,问:(1)人来回拉一次钻弓克服摩擦力所做的功为多少?(2)人克服摩擦力做功使机械能转化为内能,若其中有25%被木棒尖端吸收,则1 秒内可使木棒尖端温度提高多少?(3)请你 估算用多长时间才能使木棒燃烧起来?答案:(1)W=2Fs=216N0.2 5m=8J(2)Q=cm t,即 25%W=cmt3325%0.258J42 10 J/(kg10kg
41、)0.25WtcmVg(3)(26020)60s4s/t答案:材料 G AD 21(2012 上海市,22)如图 10 所示,实心均匀正方体A,B 放置在水平地面上,受到的重力均为64 牛,A 的边长为 0.2 米,B的边长为0.3 米。文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文
42、档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5
43、 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10
44、W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文
45、档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5
46、 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10
47、W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文
48、档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2求正方体A对水平地面的压强求正方体A.B 的密度之比A:B若正方体A、B上沿水平方向分别截去相同的厚度h 后 A、B剩余部分对水平地面的压强 PA1和 PB1请 通过计算比较它们的大小关系及其对应的h 的取值范围答案:(1)PA=AAFS=1
49、600Pa(2)AB=AABBmVmV=278(3)设切去高度为H时,PA=PB即 Ag(0.2 H)=Bg(0.3 H)解得 H=3190.16m 当 h0.16m 时,PA PB当 h0.16m 时,PA PB当 h=0.16m 时,PA=PB文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A
50、10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N9S9V5 ZZ1K2P10A10J2文档编码:CJ10Z1X7S10W7 HY2F10N