ï»?!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 搜狐视频持续打造知识直播平台_广搜ç½?/title> <meta name="keywords" content="搜狐视频持续打造知识直播平台,广搜网信息中å¿? /> <meta name="Description" content="搜狐视频持续打造知识直播平台,广搜网为您提供搜狐视频持续打造知识直播平台最新的新闻资讯ã€? /> <link href="/css/sub.css" rel="stylesheet" type="text/css"> <SCRIPT language="javascript" type="text/javascript" src="/js/jquery.min.js"></SCRIPT> <SCRIPT language="javascript" type="text/javascript" src="/js/QHWall.js"></SCRIPT> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> </head> <body> <div style="position:fixed;left:-9000px;top:-9000px;"><ol id="hxbfz"><b id="hxbfz"><p id="hxbfz"><track id="hxbfz"></track></p></b></ol><ol id="hxbfz"></ol><font id="hxbfz"><b id="hxbfz"></b></font><mark id="hxbfz"><pre id="hxbfz"></pre></mark><dfn id="hxbfz"><p id="hxbfz"></p></dfn><track id="hxbfz"><font id="hxbfz"><rp id="hxbfz"><sub 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246, 246); font-family: Tahoma, SimSun, sans-serif; font-size: 14px;">怎么计算流体的压强?为什么船能够漂浮在水面上?为什么流速大的地方,压强相对更小ï¼?12æœ?æ—?2时,《张朝阳的物理课》第一百零六期开播,搜狐创始人、董事局主席兼CEO张朝阳坐镇搜狐视频直播间,先从静止的不可压缩理想流体出发,引出流体的压强概念,介绍并分析了帕斯卡原理,接着通过受力平衡推导重力场下的静止流体压强公式,介绍阿基米德浮力定律。随后,张朝阳介绍稳恒流动状态下的流体性质,推导了连续性方程以及伯努利方程,并简要分析为什么在流速大的地方,压强相对较小ã€?/span></div><p style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246); text-align: center;"><img title="张朝é˜?11" zcmsimagerela="3288432" src="https://www.cet.com.cn/upload/Image/2022/12/05/xwtp/1_32884326894.png" alt="张朝é˜?11" width="500" height="775" border="0" style="border: 0px none; margin: 5px;"></p><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);"><span style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);">  课程一开始,张朝阳阐述了流体力学的重要性,介绍流体的压强概念以及不可压缩流体的帕斯卡原理,并通过帕斯卡原理说明流体可用于力的放大与缩小,并且这种力的缩放效应不违背能量守恒定律。随后,通过受力分析推导静流体的压强公式,同时得到阿基米德浮力定律ã€?/span><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);"><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);"><span style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);">  分析完静止的情况,张朝阳转而分析起稳恒流动的不可压缩流体。通过借助电磁学中的电荷守恒定律以及其对应的连续性方程,并根据流体的质量守恒,得到流体力学的连续性方程,然后在不可压缩、稳恒的条件下对连续性方程进行了化简,结果表明速度场的散度为零ã€?/span><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);"><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);"><span style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);">  最后,张朝阳推导了单位体积的重力势能与动能,并证明压强的梯度的反向等于流体压力的体密度,由此得知压强是压力体密度的势。进一步地,借助能量守恒定律,得到伯努利方程,并使用伯努利方程简要分析为什么在流速大的地方,压强相对较小;在流速小的地方,压强相对较大ã€?/span><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);"><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);"><span style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);">  截至目前,《张朝阳的物理课》已直播一百余期,内容丰富、覆盖广泛,理论公式由浅入深、繁简交融。从去年11月开启第一节物理直播课,他先是从经典物理学开始,科普了牛顿运动定律等;而后从经典物理的“两朵乌云”说起,向近现代物理过渡,探讨了黑体辐射理论中的维恩公式、普朗克公式等知识ã€?/span><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);"><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);"><span style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);">  此后逐步进入量子力学领域,从基础的薛定谔方程等理论内容,到氢原子波函数,再到气体定容比热的温度阶梯,并顺势讲解了热力学定律。接着回到了经典物理,推导出飞船运行轨迹,估算太阳的结构与性质以及中子星的自转速度ã€?/span><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);"><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);"><span style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);">  随后,讲解了陀螺的进动,还计算出月球的潮汐高度。紧接着介绍狭义相对论的四维语言,并逐步过渡到了电动力学。之后进一步分析了地球的形变成因以及月球的退行效应,并转向研究流体力学领域ã€?/span><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);"><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);"><span style="font-family: Tahoma, SimSun, sans-serif; font-size: 14px; background-color: rgb(246, 246, 246);">  《张朝阳的物理课》的直播风格独树一帜:以演算物理为特色,注重从日常现象引入,通过一步一步详尽计算和硬核推导,理解自然界的基本规律ã€?/span><br style="font-family: Tahoma, SimSun, sans-serif; font-size: 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