高考物理(深化复习-命题热点提分)专题05-功-功率-动能定理.doc
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高考物理(深化复习-命题热点提分)专题05-功-功率-动能定理.doc
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试题-全国-2017_2017年高考物理(深化复习+命题热点提分)专题05 功 功率 动能定理.doc
12专题05功功率动能定理1.如图1,质量为m的小猴子在荡秋千,大猴子用水平力F缓慢将秋千拉到图示位置后由静止释放,此时藤条与竖直方向夹角为θ,小猴子到藤条悬点的长度为L,忽略藤条的质量。在此过程中正确的是()图1A.缓慢上拉过程中拉力F做的功WF=FLsinθB.缓慢上拉过程中小猴子重力势能增加mgLcosθC.小猴子再次回到最低点时重力的功率为零D.由静止释放到最低点小猴子重力的功率逐渐增大答案C2.质量为m的物块甲以3m/s的速度在光滑水平面上运动,有一轻弹簧固定其上,另一质量也为m的物体乙以4m/
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