velocity n. 1.迅速;快速。 2.速度,速率。 3.周轉(zhuǎn)率。 at a velocity of 100 miles per hour 用每小時(shí)一百英里的速度。 dart off with the velocity of a bird 像鳥一樣迅速飛跑過去。 drag-free velocity無阻力飛速,真空飛速。 escape velocity(克服地球引力的)第二宇宙速度,逃逸速度。 final velocity (發(fā)射物的)終速。 initial [muzzle] velocity(發(fā)射物的)初速[腔口速度]。 uniform [variable] velocity勻[變]速。
Supernova explosion at song dynasty and the principle of constancy of light velocity 宋代超新星爆發(fā)事件與光速不變原理
The method of velocity of light measuring with the cg - iii of light velocity apparatus is improved , the measuring accuracy is increased significantly 摘要對(duì)cg -型光速測定儀的測量方法作了改進(jìn),通過實(shí)際測量的結(jié)果表明,該實(shí)驗(yàn)方法改進(jìn)后,光速測量的精度有了很大提高。
He pointed out that , according to the principle of constancy of light velocity , the length of an object in the direction of its movement looked shorter when relative speed of the object was high enough 對(duì)這一論點(diǎn)誰也沒有產(chǎn)生過懷疑,但有一個(gè)人對(duì)此首先發(fā)難,他就是愛因斯坦。本世紀(jì)初1905年,愛因斯坦提出:當(dāng)物體的相對(duì)速度較大時(shí),這個(gè)物體沿運(yùn)動(dòng)方向的長度“看上去”會(huì)變短。