作业帮初一的题目（科学和英语）科学：小明用100牛的水平方向的力去推放在水平面的桌子,课桌在30秒内匀速移动了6米.已知课桌的质量为30千克.求：（1）课桌受到的摩擦力为多大?（2）小明推课
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初一的题目（科学和英语）科学：小明用100牛的水平方向的力去推放在水平面的桌子,课桌在30秒内匀速移动了6米.已知课桌的质量为30千克.求：（1）课桌受到的摩擦力为多大?（2）小明推课
初一的题目（科学和英语）
科学：
小明用100牛的水平方向的力去推放在水平面的桌子,课桌在30秒内匀速移动了6米.已知课桌的质量为30千克.求：
（1）课桌受到的摩擦力为多大?
（2）小明推课桌的速度为多少?
英语嘻……
Thomas Edison was one of the greatest inventors in the world.Without his inventors,people may not have lights,films and many other things.But this very elever man had very little scholing.
Edison began to make a talking machine in 1877.At first,he used paper to make a soud.He worked for months on this idea.At last he found out how to record a person's voide.But the first machine was very simple and the voice was ones on the talking machine.This time the voice could be played back and the voice was also very clear.After the World War II,others used his methods,and then came the first modern tape recorder.It is much easier to record.How great Edison was
1.Edison _________ very little schooling when he ___ young.
2.The first talking machine he invented __________ very slmple and the voice _________ ___________ ________
3.The first modern tape recorder _________invented ________ the World War II
初一的题目（科学和英语）科学：小明用100牛的水平方向的力去推放在水平面的桌子,课桌在30秒内匀速移动了6米.已知课桌的质量为30千克.求：（1）课桌受到的摩擦力为多大?（2）小明推课
科学
1.F摩＝F＝100N
2.V＝s/t=6m/30s=0.2m/s
英语
1.had was
2.was was very clear
3.was after