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然而，共有兩種電荷——正電荷和負(fù)電荷，同種電荷之間的力是互相排斥的，而異種電荷則互相吸引。[3]萬有引力引力是萬有的，也就是說，每一粒子都因它的或能量而受到引力。引力比其他三種力都弱得多。它是如此之弱，以致于 任何時刻運動狀態(tài)的機械決定論、事物發(fā)展的因果律等等。
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完全相等。為了避免這種困難，規(guī)定地球表面的某一特定點作為測量物體的重量的場所。所以，引力制的程度并不比所謂制的程度差。制的力的單位為達因和。1達因是使1克的產(chǎn)生1厘米/秒2加速度的力；1是使1千克 我們應(yīng)當(dāng)承認(rèn)它至少帶來了一些有用的技術(shù)和工具。并且煉金術(shù)可能或多或少地激發(fā)了的靈感，有助于他在科學(xué)領(lǐng)域中的和發(fā)現(xiàn)?？茖W(xué)巨人同樣可能走向歧途，他們的人格或個性也可能存在著這樣或那樣的缺陷。
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有一個值為P·d的轉(zhuǎn)矩作用于縱桿AA′，從而在A點將杠桿拉向左側(cè)，而在A′點將杠桿推向右側(cè)。但由于杠桿受到EE′點的，在A、A′上將分別產(chǎn)生大小相等、方向相反的反作f、f′，從而形成一個與P·d相等的反向轉(zhuǎn)矩f·s（f′·s），結(jié)果P·d轉(zhuǎn)矩被f·s（f′·s）所平衡。在A、A′上只有與P相等的力起作用，而與P在橫臂上的作用位置d無關(guān)。這種情況在EE′的右側(cè)也完全相同。阻力天平在梁上掛上專門的阻力盒使天平的能迅速停止。單盤不等臂機械天平也是以杠桿平衡原理設(shè)計的。工作時，在加上被衡量物體后，減去懸掛上的砝碼，使橫梁始終保持全載平衡狀態(tài)。所減砝碼加上微分度牌讀數(shù)值，就是被衡量物體的。就確定了冷卻定律，即當(dāng)物體表面與周圍有溫差時，單位時間內(nèi)從單位面積上散失的熱量與這一溫差成正比。[4]天文成就1672年創(chuàng)制了反射望遠鏡。他用質(zhì)點間的萬有引力證明，密度呈球?qū)ΨQ的球體對外的引力都可以用同的
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并采用數(shù)字指示輸出結(jié)果的計量。使用方便快捷，廣泛應(yīng)用在工業(yè)生產(chǎn)，食品安全，衛(wèi)生，以及貿(mào)易結(jié)算等領(lǐng)域。秤量的準(zhǔn)確性直接影響著數(shù)據(jù)結(jié)果的準(zhǔn)確性，因而操作人員的正確使用對確保數(shù)據(jù)結(jié)果的準(zhǔn)確性非常關(guān)鍵，在實際檢測工作中，常見存在的問題有以下幾方面：1天平的安放天平要正確安放是在安全稱重室或穩(wěn)固的工作臺上，規(guī)避因素帶來的氣流波動，溫度變化大，陽光直射的地方，振動和靜電等。這是天平安置條件基本的要求。平時在檢測工作中，在一些企業(yè)實驗室?？吹教炱脚c干燥箱馬沸爐振動臺等混放一起，這些都會造成電子天平在使用中出現(xiàn)不或無法稱重的現(xiàn)象。2經(jīng)常保持天平室內(nèi)的衛(wèi)生在到企業(yè)檢定時，一些化驗室緊鄰車間，生產(chǎn)中產(chǎn)生的煤粉或其它粉塵散落在天平內(nèi)外。關(guān)于在1692～1693年間答復(fù)本特萊大主教4封信論造物主（，，，亞伯拉罕）之存在，為后人所詬病。所謂神臂就是推動出于第四封信中。從現(xiàn)代宇宙學(xué)來說，推動完全可能在物理框架中解決，而無需“神助”。反對
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自然間的所的后源泉是隱藏著的靈魂，它才是一切物理活動的根源。當(dāng)然，這種形而上學(xué)的觀點很難用來解釋像萬有引力所產(chǎn)生的那種運動。在亞里士多德的著作中，力被看作是從一個物體發(fā)另一物體中去的。這種發(fā)射的力本身不 完全改變了、宗教思想、和哲學(xué)。2003年，英國廣播公司在一次全球性的評選偉大的英國人活動當(dāng)中，被評為偉大的英國人之首。在《偉大的英國人》系列紀(jì)錄片中專門編輯了專集的歷史學(xué)家特里斯特拉姆·亨特表示：“
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觀察，發(fā)展出了顏色理論。他還地表述了冷卻定律，并研究了音速。在數(shù)學(xué)上，與戈特弗里德·萊布尼茨分享了發(fā)展出微積分學(xué)的榮譽。他也證明了廣義二項式定理，提出了“法”以趨近函數(shù)的零點，并為冪級數(shù)的研究作出了 1643年1月4日—1727年3月31日）爵士，英國皇家學(xué)會會長，英國的物理學(xué)家，百科全書式的“全才”，著有《自然哲學(xué)的數(shù)學(xué)原理》、《光學(xué)》。他在1687年發(fā)表的論文《自然定律》里，對萬有引力和三大運動定律進行了描述。這些描述