# Yahoo奇摩 網頁搜尋

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1. ### momentum and time

...be positive or negative, depending on the direction of force. 2015-07-28 16:15...question: I don't know where you get this equation: momentum =f(time), but it ...quot;. An impulse leads to a "CHANGE of momentum". 2015...

2. ### 3 physics MCQs

...you wouldn't be able to get the path as given in...less the field lines and move towards the left. 2014-08-11...they should be of the same sign? A : This is the...question doesn't give anything on the signs of Q...

3. ### F.4 Physics 一個關於inertia既問題 測驗用

...need no force to keep you moving . As such, you feel no force acting on you. (c) When the..." is a physical quantity used...plane B has got a larger inertia...

4. ### phy wave

...double reflections on the mirrors. A ray of light on the left hand side of the wavefront first...of the wavefront. 2. When Tommy moves at 2 m/s towards the mirror, his image also...

5. ### Physics Forces!

... at t = 12 s is (75.79 + 18.95) m/s = 94.74 m/s Q2. ( a ) Based on the given graph, the elevator is descending. The max apparent...

6. ### loads of phy questions

... normal reaction and weight are equal to each other when a person is IN EQUILIBRIUM. When the person is moving in circular motion, he is surely NOT in equilbrium.... 2013-08...

7. ### physics - Force

( a ) When the proton moves an infinitetesimal displacement dx, work done dW = F.dx Hence...

8. ### free electron

...lattice of +ve metal ions in a sea of delocalized ... are free to move and thus got the name "free electrons... property lies on the fact that most metal atoms...

9. ### proof of KE=1/2mv^2

...would overestimate the actual displacement that travelled. That's why you got twice the amount of the actual kinetic energy. The correct derivation is...

10. ### phy.astronomy

... the radius of orbit. Should we want to get into a lower orbit, we need to utilize the gravitational pull and... the spacecraft to start falling down. [continue on the opinion (意見) section] 2012-09-29 14:25:35 補充...

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