满分5 >
初中物理试题 >
一位同学沿教学大楼的楼梯匀速登高了3米,该同学登楼做的功最接近( ) A.150...
一位同学沿教学大楼的楼梯匀速登高了3米,该同学登楼做的功最接近( )
A.15000J
B.1500J
C.150J
D.15J
考点分析:
相关试题推荐
下图的几种情景中,人做了功的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131104181418178554787/SYS201311041814181785547003_ST/images0.png)
踢出去的足球草地上滚动一段距离
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131104181418178554787/SYS201311041814181785547003_ST/images1.png)
司机推汽车,纹丝不动
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131104181418178554787/SYS201311041814181785547003_ST/images2.png)
女孩把一箱报刊搬起来
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131104181418178554787/SYS201311041814181785547003_ST/images3.png)
学生背着书包在水球在平路面上匀速前进
查看答案
如图所示,不考虑滑轮与轻绳之间的摩擦,米袋总重为800N,而绳上吊着的静止的“绅士”重500N,则米袋对地面的压力为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131104181418178554787/SYS201311041814181785547002_ST/images0.png)
A.500N
B.250N
C.300N
D.800N
查看答案
如图所示,表示用滑轮或滑轮组提起同一重物的几种方法,其中最省力的是(动滑轮重和摩擦忽略不计)( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131104181418178554787/SYS201311041814181785547001_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131104181418178554787/SYS201311041814181785547001_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131104181418178554787/SYS201311041814181785547001_ST/images2.png)
D.
查看答案
如图所示,正常使用时属于费力机械的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131104181418178554787/SYS201311041814181785547000_ST/images0.png)
定滑轮
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131104181418178554787/SYS201311041814181785547000_ST/images1.png)
扳子
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131104181418178554787/SYS201311041814181785547000_ST/images2.png)
镊子
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZWL/web/STSource/20131104181418178554787/SYS201311041814181785547000_ST/images3.png)
自行车的车把
查看答案
将边长是10cm的实心立方体木块轻轻地放入盛满水的大水槽内.待木块静止时,从水槽中溢出了600g水,g取10N/kg,求:
(1)木块受到的浮力;
(2)木块排开水的体积;
(3)木块的体积
(4)木块露出水面的体积;
(5)木块受到的重力;
(6)木块的质量;
(7)木块的密度.
查看答案