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小红利用弹簧测力计、物体A(重12N)、烧杯、水、盐水、细线等器材做影响浮力大小因素的实验,下表是她记录的实验数据.(1)比较1,2,3次实验可知浮力的大小与 有关,分析第3,4次实验可知浮力的大...
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教案备课库《第四章力学 能力测试B(121-125页)》真题及答案
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一个物体重20N悬挂在弹簧测力计下使其全部浸没水中弹簧测力计示数15N物体密度为.
一个物体挂在弹簧测力计下端静止时弹簧测力计的示数为1.47N将物体浸没在水中时弹簧测力计的示数为0.
有一个实心球形物体用弹簧测力计在空气中称重时测力计的示数为12N当把物体一半体积浸入水中时测力计的示
5N.
7N.
14N.
12N.
用弹簧测力计称得容器和水的总重为5N如图甲所示.将体积为10cm3的物体
全部投入水中,弹簧测力计的示数T
1
为0.4 N (如图乙所示).若将容器、水和浸投水中的物体A.用弹簧测力计一起称量 (如图丙所示),弹簧测力计的示数为T
2
.则
A.浸没水中的物体A.所受浮力为0.1N.
浸没没水中的物体A.所受浮力为0.4N
弹簧测力计的示数T
2
为5.5N
弹簧测力计的示数T
2
为5.1N.
如图所示实验装置甲重16N乙重12N静止时不计弹簧测力计自重则弹簧测力计的示数是
16 N
12 N
28 N
4 N
2014•泰安有一个实心球形物体用弹簧测力计在空气中称重时测力计的示数为12N当把物体一半体积浸入水
一个物体挂在竖直放置的弹簧测力计挂钩上静止时弹簧测力计的示数是3N若将物体浸到水中静止的弹簧测力计的
有一准确的弹簧测力计放在水平桌面上两位同学各拉该测力计的一端使弹簧测力计在桌面上静止测力计的示为6N
均为3N
均为6N
均为12N
分别为6N和12N。
一个重1N的物体挂在弹簧测力计上当物体浸没在水中时弹簧测力计的示数是0.88N当物体浸没在另一种未知
如图所示当吊在弹簧测力计下的物体浸在水中的体积为物体体积的1/3时弹簧测力计的示数为5.0N当物体浸
9.0N
8.5N
8.0N
7.5N
如图所示实验装置甲重16N乙重12N静止时不计弹簧测力计自重则弹簧测力计的示数是
16 N
12 N
28 N
4 N
一个重1N的物体挂在弹簧测力计上当物体全部浸没在水中时弹簧测力计的示数是0.8N当物体恰好有一半浸入
将一个重4N的物体挂在弹簧测力计下面然后将物体浸没在重6N的水中这时弹簧测力计的示数为3N则物体所受
6N
3N
2N
1N
如图所示足够长的长方体木板甲在大小为12N的水平拉力F作用下以0.2m/s的速度在水平地面上匀速运动
F=12N时,地面受到的摩擦力为6N
F=12N时,滑轮移动的速度为0.4m/s
F=12N时,绳子拉物体甲的功率为1.6W
F=16N时,弹簧测力计的示数为2N
弹簧测力计挂着一重为3N的物体物体浸没在水中静止时如图所示弹簧测力计的示数是N.如果测力计不拉着物体
有一个实心球形物体用弹簧测力计在空气中称重时测力计的示数为12N当把物体一半体积浸入水中时测力计的示
5N
7N
14N
12N
一个物体挂在竖直放置的弹簧测力计挂钩上静止时弹簧测力计的示数是3N若将物体浸到水中静止的弹簧测力计的
有一个实心球形物体用弹簧测力计在空气中称重时测力计的示数为12N当把物体一半体积浸入水中时测力计的
如图所示用10N的水平拉力F.拉滑轮使足够长的物体
以0.2m/s的速度在水平地面上匀速运动,弹簧测力计的示数为3N。若不计滑轮重、弹簧测力计重、绳重和滑轮摩擦,则下列说法中正确的有A.
受到的摩擦力为3N,方向水平向左B.滑轮移动的速度为0.1m/s
绳子拉物体A.的功率为2W
在运动过程中若将拉力F.增大到12N,弹簧测力计的示数仍为3N
用弹簧测力计在空气中测得某物体重8.9N现将该物体浸没在水中弹簧测力计的示数变为7.9N则物体所受到
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小明同学用一个薄壁玻璃瓶带色的水两端开口的细玻璃管橡皮塞自制了如图所示的气压计. 1他从管子上端吹入少量气体使瓶内气压选填“大于”“小于”或“等于”大气压水沿玻璃管上升到瓶口以上 2为了探究大气压与高度的关系小明同学用双手捧着自制的气压计从教学大楼的一楼跑到五楼发现细玻璃管中的水面上升于是他得出了“高度越低大气压越小”的结论.小明的结论是选填“可靠”或“不可靠”的.此过程中使水面上升的主要原因可能是.
----DoyouimproveyourspokenEnglishbycommunicatingwithothersorreadingaloud? ----________.Imakelotsofnewfriendsinthiswaytoo.A.YesIdo. B.IlikeEnglishverymuch.C.NoIdon’t. D.Bycommunicatingwithothers.
用图甲所示的滑轮组运送货物上楼每件货物重50N每次运送的量不定图乙记录了在整个过程中滑轮组的机械效率随货物重力增加而变化的图像.由图可知动滑轮重为.当某次运送8件货物时绳子的拉力F是N滑轮组的机械效率为.不考虑绳重和摩擦
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如图所示重力为G的均匀木棒竖直悬于O点在其下端施一始终垂直于棒的拉力F让棒缓慢转到图中虚线所示位置.在转动的过程中
Mr.Chenisateacher________Iwanttolearnfrom.Heissoknowledgeable. A.which B.when C.who D.what
—doyouvolunteerinOldPeople'sHome?—Onceaweek.Wehopetohelptheoldmore.A.Howsoon B.Howmany C.Howoften D.Howlong
大气压是由于空气受到重力而产生的.如果地球的表面约为那么在标准大气压下地球周围的空气质量约为标准大气压取g=10N/kg.
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用图示装置探究斜面机械效率实验记录如下表.1沿斜面拉动物体时应使其做 运动.2根据图中测力计的示数可知第2次实验的机械效率为%.由实验可得初步结论斜面倾斜程度相同时越小机械效率越大.3第1次实验中木块所受摩擦力为.
如图所示是三峡船闸工作过程的示意图.它是利用原理来工作的.当阀门A打开阀门B关闭水从流向下游当它的水面与下游相平时下游闸门A打开船驶入闸室.
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