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</gourl2><NodeID>1266</NodeID><Title>2016聚焦中考物理考点跟踪突破：第十三讲 机械效率（陕西省35份）</Title><SoftSize>0.00</SoftSize><SoftSizeUnit>B</SoftSizeUnit><SoftSize>0.00</SoftSize><SoftSizeUnit>B</SoftSizeUnit><typeicon>doc</typeicon><editor>初中物理在线</editor><author>czwlzx</author><user>czwlzx</user><userface>/UploadFiles/UserPic/UserAvatars/15219_150_150.jpg</userface><Hits>
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				一、填空题
				
1．(2015，沈阳)如图所示的甲，乙两套装置，每个滑轮的质量均相等，用它们分别将</Intro><SoftIntro2>
				一、填空题
				
1．(2015，沈阳)如图所示的甲，乙两套装置，每个滑轮的质量均相等，用它们分别将重力为G1和G2的重物匀速提升一定高度，所用竖直向上的拉力大小分别为F1和F2，忽略绳重和摩擦．若F1＝F2，则G1__&lt;__G2；若G1＝G2，则它们的机械效率η1__＝__η2.(两空均选填“＞”“＝”或“＜”)
第1题图
　　 第2题图
		2．(2015，广州)如图所示，手用F1的力直接将物体B匀速提升h，F1做功为300J；若借助滑轮组把B匀速提升相同高度，滑轮组机械效率是30%，则F2做功为__1000__J.
3．(2015，聊城)如图所示，在“测量滑轮组机械效率”的实验中，物体重6N.沿竖直方向匀速拉动弹簧测力计，物体上升高度为10cm，此时弹簧测力计的示数为__2.4</SoftIntro2><SoftIntro>
    【内容简介】
				一、填空题
				
1．(2015，沈阳)如图所示的甲，乙两套装置，每个滑轮的质量均相等，用它们分别将重力为G1和G2的重物匀速提升一定高度，所用竖直向上的拉力大小分别为F1和F2，忽略绳重和摩擦．若F1＝F2，则G1__<__G2；若G1＝G2，则它们的机械效率η1__＝__η2.(两空均选填“＞”“＝”或“＜”)
第1题图
　　 第2题图
		2．(2015，广州)如图所示，手用F1的力直接将物体B匀速提升h，F1做功为300J；若借助滑轮组把B匀速提升相同高度，滑轮组机械效率是30%，则F2做功为__1000__J.
3．(2015，聊城)如图所示，在“测量滑轮组机械效率”的实验中，物体重6N.沿竖直方向匀速拉动弹簧测力计，物体上升高度为10cm，此时弹簧测力计的示数为__2.4__N，滑轮组的机械效率是__83.3%__．二、选择题
4．(2015，滨州)如图，用滑轮组提升重物时，重800N的物体在10s内匀速上升了1m.已知拉绳子的力F为500N，则提升重物的过程中( B )
A．绳子自由端被拉下3m
B．做的有用功是800J
C．拉力F的功率是80W
D．滑轮组的机械效率是60%
..........
		?</SoftIntro><SoftIntroEncode>
				一、填空题
				
1．(2015，沈阳)如图所示的甲，乙两套装置，每个滑轮的质量均相等，用它们分别将重力为G1和G2的重物匀速提升一定高度，所用竖直向上的</SoftIntroEncode><special /><DownloadUrl>下载地址1|stzx_UploadFiles_64/201603/2016032205432000.doc</DownloadUrl><Content>&lt;p&gt;
				&lt;strong&gt;一、填空题&lt;/strong&gt;
				&lt;br /&gt;
1．(2015，沈阳)如图所示的甲，乙两套装置，每个滑轮的质量均相等，用它们分别将重力为G1和G2的重物匀速提升一定高度，所用竖直向上的拉力大小分别为F1和F2，忽略绳重和摩擦．若F1＝F2，则G1__&amp;lt;__G2；若G1＝G2，则它们的机械效率η1__＝__η2.(两空均选填“＞”“＝”或“＜”)&lt;br /&gt;
第1题图&lt;br /&gt;
　　 第2题图&lt;/p&gt;
		&lt;p&gt;2．(2015，广州)如图所示，手用F1的力直接将物体B匀速提升h，F1做功为300J；若借助滑轮组把B匀速提升相同高度，滑轮组机械效率是30%，则F2做功为__1000__J.&lt;br /&gt;&lt;br /&gt;
3．(2015，聊城)如图所示，在“测量滑轮组机械效率”的实验中，物体重6N.沿竖直方向匀速拉动弹簧测力计，物体上升高度为10cm，此时弹簧测力计的示数为__2.4__N，滑轮组的机械效率是__83.3%__．&lt;br /&gt;&lt;strong&gt;二、选择题&lt;/strong&gt;&lt;br /&gt;
4．(2015，滨州)如图，用滑轮组提升重物时，重800N的物体在10s内匀速上升了1m.已知拉绳子的力F为500N，则提升重物的过程中( B )&lt;br /&gt;
A．绳子自由端被拉下3m&lt;br /&gt;
B．做的有用功是800J&lt;br /&gt;
C．拉力F的功率是80W&lt;br /&gt;
D．滑轮组的机械效率是60%&lt;br /&gt;
..........&lt;/p&gt;
		&lt;p&gt;?&lt;/p&gt;</Content><banben>不限</banben><area>陕西</area><type>试题试卷</type><type2>专供vip会员</type2><ico>doc</ico><video>
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