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...object moves in a circle.Is the total work done on the object by external forces necessarily zero?explain~ 1:物體做圓周運動時外力所作的功為0 2:因為外力提供的...

...gt; a = 8/5 (m/s^2) F=ma --> F = (5)(8/5) = 8 N (the external force applied to 5kg)) now apply the same external force to 20kg. F=ma -->...

... (glass, crown, strap) and misusages ( any collisions by external forces to cause water infiltration) are not covered by the warranty. The...

...motion and force (action): The 1st law (law of inertia) says, if the total external force is zero, then whatever is moving will move at a constant velocity...

... of motion as an example: 1st Law of motion (law of inertia): if the total external force is zero, then whatever is moving will move at a constant velocity...

... referred to the momentum in a blow, in contrast to "sharp" force , sucn as that from a knife, bullet, pointed objects..... etc. which can inflict external injuries as penetrations, cut wounds and puncture ...

O-ring release about reflected the other day, quite unexpectedly found hurt at the bottom, on this we recognize injuries are caused by external forces , based on long-term cooperation agreement can help us handle

1.題目是要你舉例一個外力合不為零,但是系統的速率為一定值的情況 最明顯的就是圓周運動拉，圓周運動的合力恆指向圓心，但是速度卻保持不變，不過速度就有變化了，因為方向一直在改變 2. 反過來問，什麼情況外力為零，速率不為零，這提更簡單了，那就是等速度運動阿，在外太空...