九年級物理書答案？答案：雞蛋放在鹽水中，過一段時間就會變咸；在衛(wèi)生間的一角滴上一滴香水，整個衛(wèi)生間都能聞到香水味。2． 分別在冷水杯和熱水杯中放入糖塊，經(jīng)過相同的時間后，品嘗杯中的水，哪一個更甜？為什么？答案：熱水更甜。因為熱水溫度高，糖溶化后擴散得快。那么，九年級物理書答案？一起來了解一下吧。
九年級物理答案..急
第一題A
這一題考相對運動，C，D不用解釋，B正確是因為乘客所坐的車速度比被觀察的車速度慢。
第二題D
這一題考力矩，杠桿平衡是因為兩個相反方向作用的力矩相等。
第三題C
這一題考氣流流速與壓強的關(guān)系，流速越大對接觸面的壓強越小。
第四題
不知道這里的郵輪質(zhì)量是指空載還是滿載。
如果是空載，質(zhì)量就是5000000，如果滿載，質(zhì)量就是15000000。后一個空格的答案是前一個空格答案乘以10。
第五題
平行于彈簧伸縮方向的力；4；8。
第六題
100J；0J；10N
恒力做功等于力的大小乘以物體在力的方向上運動經(jīng)過的距離。因為是勻速運動，摩擦力和拉力是一對平衡力，大小相等，方向相反。
第七題
輸出；輸入；100%或1
之一題考概念，類似于背書。
第八題
小；大；把人推向車身
這和之前風(fēng)箏的題目考的是同一個知識點。
第九題
同學(xué)爬樓的時間t、樓房的高度h；秒表、皮尺；mgh/t
回答完畢。
珍愛生命小短文 急
珍愛生命，拒闖紅燈As you know，the rules of the traffic is very imporTant. But recently there are some pedesteians always run red lights who didn"t realize the bad results becamse of their behaves. For example, disturbing the normal turns of the traffic, causing a series of aidents danger for people's lifies and bad spirit in society . Of cause if you broken the rule you would be punished like warning and paying the money for your behave. In my opinion,obey the rules of traffic is the responsibility of evevryone but not the thing we have to do under other people's asking. love life,refuse running red lights!珍愛生命愛護地球I recently read, "If the Earth's remaining three days of life" feeling a lot of this article. This essay describes is this: the Earth has only three days of life. "I am" very alarmed, even the insects are usually afraid of death I will now have to face the advent of very frightened. By this time, "I" know that there are a lot of good things, but I have not noticed. In three days I have met a lot of things, gradually bees the mind. Three days have passed, and the face of death to e, but I did not drop tears fall.
From this writing that I learned that the world is beautiful, there are many beautiful things. Sometimes, although there are some disappointments, but this is also an experience, a very rare experience. If and when their lives will be at the end, she wanted to experience the experience is unlikely.
This essay I recognize that life is very precious. Whenever I see a news item that some university student who can not stand the pressure to learn, suicide or run away from home, my heart was always in pain. Although I know that their learning is very bitter, but it should not mit suicide 呀! He should also think about their own future, their own well-being of the future, must not be so easily give up their lives.
This is an essay also let me know: you should be able to support hard, withstand temper. Only be able to support the pain in order to withstand temper yourself to bee stronger, and better academic performance also will be able to. When his clas *** ates had a great admiration a character, may have thought of these great men, he had the number of sweat flow, after the number of endurance test was the remarkable results of everybody distressing 呀!
Reading, reading, I can not help but think of our mon homeland of humanity - the Earth. Our technology may be developed than ever before, and perhaps our food, clothing, shelter, a lot better than before, but have you ever thought that in we are developing at the same time, the earth has not aged. Of view, the former brook no longer exist, replaced by a suession of people met on the disgusting *** ell ditch; before the air is very fresh, but now the air and bad days than in the past is simply to do 呀 .. ....
Let us cherish life, caring for the earth, doing a live a worthy person bar.
實習(xí)工作總結(jié) 急！!
我只能告訴你怎樣寫好，感謝領(lǐng)導(dǎo)+對公司的認識（很重要）+對崗位認識+成績+不足+下一步目標(biāo)，最重要寫出自己的信心
這道題怎么寫啊？急
x+5/6x=11/9
17/6x=11/9
X=22/51
急！請面板專家?guī)兔Γ?/p>
溫馨提示：回復(fù)只是給您提供參考意見，不能代替臨床診斷。
物理公式 電流 定義式I=Q/t
歐姆定律 I=U/R
串聯(lián)電路I=I1=I2，并聯(lián)電路I=I1+I2
電壓 串聯(lián)電路U=U1+U2 ，并聯(lián)電路U=U1=U2
電阻 串聯(lián)R總=R1+R2 ，并聯(lián)R總=R1R2/(R1+R2)
電功率定義式P=W/t普適公式P=UI
電功 定義式W=UIt
已知電功率W=Pt
已知電量W=UQ
導(dǎo)體熱量 焦耳定律Q=I2Rt
面積正方形S=a2 ，長方形S=ab ，圓S=π（D/2）2
體積 柱體V=Sh ，排液法V固=V2-V1 正方體V=a3
浸沒時V排=V物
速度 定義式v=s/t 平均速度v=s總/t總
密度 定義式ρ=m/V
重力 G=mg
浮力 公式法F浮=ρ液gV排稱重法F浮=G-F' 漂浮和懸浮F浮=G
阿基米德原理F浮=G排 產(chǎn)生原因F浮=F向上-F向下 沉底時F浮=G-N
壓強定義式p=F/S
液體內(nèi)部p=ρgh
功率(機械) 定義式P=W/t 汽車功率P=Fv 功(機械) 定義式W=Fs 總功W總=W有用+W額
杠桿平衡條件 F1l1=F2l2 力 同方向F合=F1+F2 反方向F合=F1-F2
水平桌面上受到物體的壓力F=G總
液體、氣體的壓力F=pS
機械效率 定義式η=W有用/W總 提升重物η=Gh/Fs 水平移動重物η=fs物/Fs
熱量 燃料燃燒Q=qm 物體吸放熱Q=cmΔt
機械能 機械能=動能+勢能 Q=U^/Rt Q=I^Rt
3.W=15/3000Kw.h=18000J
P=W/t=18000/60w=300w
4.R=U2/P
P實=（80%U)2/R=640W
5.W1=P1t=100×0.06×4J=24Kw.h
W2=P2t=100×0.04×4J=16Kw.h
△W=(W1-W2)T=(24-16)×365Kw.h=2920Kw.h
1．瓶口朝上時，受到水向下壓強，使橡皮膜向內(nèi)凹，瓶口朝下時，受到水向下的壓強，使橡皮膜向內(nèi)凹。因為液體的壓強隨深度的增加而增大，橡皮膜在下端時比上端時的深度大，受到水的壓強比在上端時大，所以橡皮在下端時比在上端時凹進更多。
2．因為細長容器中液體深度大，所以細長容器底受到的壓強更大。
3.P=ρgh=1030×10×50=515000Pa
4. P=ρgh=1000×10×130=1300000Pa
1-因為受到了水的壓力。因為液體下面壓強比上面壓強大
2-第二幅，因為第二幅液體較高
3-已知：h=50m
求：P
解：P=phg=1.03×10 3kg／m3×9.8N=5.047×10 5pa
4-已知：h=130m
求：P
解：P=phg= 3kg／m3×130m×9.8N=1.274×10 6pa
以上就是九年級物理書答案的全部內(nèi)容，第1節(jié) 光的直線傳播 第一部分：知識點 一、 基本概念：1、光源：能夠發(fā)光的物體叫光源。 分類：自然光源，如 太陽、螢火蟲；人造光源，如 篝火、蠟燭、油燈、電燈。 注：月亮本身不會發(fā)光，它不是光源。2、規(guī)律：光在同一種均勻介質(zhì)中是沿直線傳播的。3、內(nèi)容來源于互聯(lián)網(wǎng)，信息真?zhèn)涡枳孕斜鎰e。如有侵權(quán)請聯(lián)系刪除。
