我叫沃尔特-略文。
Walter Lewin, a physics professor at M.I.T., is especially popular. Fans enjoy his entertaining demonstrations.
例如麻省理工物理学教授沃尔特.莱文，由于大量爱好者喜欢他充满乐趣的演示和讲解而备受欢迎。
So the work that Walter Lewin has to do to bring it from A to B is the integral in going from A to B of my force, dx.
所要做的功,就等于A到B的,我的力的积分,这是个点积。
Only now is there no acceleration so I can write down that force of Walter Lewin plus the force of gravity equals zero.
加速度才为零,写出来就是：我给它的力,与重力之合力等于零。
So here comes the work that Walter Lewin has to do when we go from infinity to that point, which is capital R, radius, from this object.
所以，这就是,我要做的功,从无穷远处移到这点，也就是距离这个物体，距离为R处。
There is a famous film of one of MIT's star professors, the physicist Walter Lewin, demonstrating the relationship between an oscillating metal ball and mass.
有一部很有名的电影，是关于麻省理工一个有名教授的电影，即物理学家Walter Lewin演示震荡金属球和质量间的关系。
Walter Lewin USES rubber hose, wooden boxes with holes, metal plates and an assortment of other home-made instruments to demonstrate how objects produce sound.
Lewin教授利用橡胶水管、有孔的木盒、金属盘以及其它自制的装置来示范物体如何发声。
The formal definition is that the gravitational potential energy at a point P is the work that I, Walter Lewin, have to do to bring that mass from infinity to that point P.
形式定义就是,它在点P的重力势能,等于我，将物体从无穷远处,移动至点P所做的功。
Walter Lewin, though, has asked APOD to pose this as a challenge to astrophotographers: create a real single-exposure image of a clear night sky that features 360 degree star trails.
沃尔特·卢因通过APOD向广大天体摄影师发起挑战——拍摄一幅360度星流迹的单曝光晴朗夜空照片。
Walter Lewin, though, has asked APOD to pose this as a challenge to astrophotographers: create a real single-exposure image of a clear night sky that features 360 degree star trails.
沃尔特·卢因通过APOD向广大天体摄影师发起挑战——拍摄一幅360度星流迹的单曝光晴朗夜空照片。
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