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高中物理谁的网课老师讲得好

发布时间:2021-05-21 来源:简单网校 发布人:tusya

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老师讲课很幽默!让我对作文写作有了新的认识!

收获很大,学到了很多课外知识,积累了名言诗词,对知识有自己的感悟。

听完课后,我对考场材料作文有了更深层次的理解,了解了针对考场材料作文的应试技巧。

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1)常见的力

1.重力G=mg(方向竖直向下,g=9.8m/s2≈10m/s2,作用点在重心,适用于地球表面附近)

2.胡克定律F=kx{方向沿恢复形变方向,k:劲度系数(N/m),x:形变量(m)}

3.滑动摩擦力F=μFN{与物体相对运动方向相反,μ:摩擦因数,FN:正压力(N)}

4.静摩擦力0≤f静≤fm(与物体相对运动趋势方向相反,fm为静摩擦力)

5.万有引力F=Gm1m2/r2(G=6.67×10-11N?m2/kg2,方向在它们的连线上)

6.静电力F=kQ1Q2/r2(k=9.0×109N?m2/C2,方向在它们的连线上)

7.电场力F=Eq(E:场强N/C,q:电量C,正电荷受的电场力与场强方向相同)

8.安培力F=BILsinθ(θ为B与L的夹角,当L⊥B时:F=BIL,B//L时:F=0)

9.洛仑兹力f=qVBsinθ(θ为B与V的夹角,当V⊥B时:f=qVB,V//B时:f=0)

2)力的合成与分解

1.同一直线上力的合成同向:F=F1F2,反向:F=F1-F2(F1>F2)

2.互成角度力的合成:

F=(F12F222F1F2cosα)1/2(余弦定理)F1⊥F2时:F=(F12F22)1/2

3.合力大小范围:|F1-F2|≤F≤|F1F2|

4.力的正交分解:Fx=Fcosβ,Fy=Fsinβ(β为合力与x轴之间的夹角tgβ=Fy/Fx)

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有趣的劳动节英语作文_1000字

A wind and the calendar of the afternoon, me and my mother, cousin and the cousin yo dog to clean air, scenic Geleshan play. Small colorful flowers to welcome our arrival with a smile; Xiaocaohu their small head out and waved to us. We enjoy the beautiful scenery while hiking.

Along the way, yo dog to hop to hop from time to time naughty and jumped into the water hole, the others have a muddy splash. We came to a rock and saw the beautiful, fragrant honeysuckle fill the fields. Cousin cousin and I could not wait to pick up the pick pocket honeysuckle. Pick a pick, and I was honeysuckle mixed with a bit of rattan, the foot-slip, fall down on. If my hand tightly grasped the honeysuckle vines and perhaps on to pieces of it. End mining flowers, the mother asked us: "Do you know what the benefits of honeysuckle it?" Cousin said: "Honeysuckle is Shannon." Cousin said: "Honeysuckle Qingre, Reduce Pathogenic Fire." I said : "Honeysuckle can also be down summer heat." her mother said: "You are right, but the best place honeysuckle is native, does not appreciate other people's live."

After the play, I not only enjoy the beautiful scenery, but also to understand the truth in life. Ah really gain a lot.

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