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

  8. ...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. ...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. ... 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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