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  1. ... (7) Rm=(N-1)Rg (8) http://www.phy.ncu.edu.tw/ notes / down /elecmeter/purpose.htm 范德格拉夫起電機是由美國科學家范德格拉夫 (1901- 1967) 於1931...

  2. ... d = Vmt1 t1 = d/Vm ... (1) For the man to swim down the river, The relative velocity of the man to the bank = Vm + Vw...

  3. ...work done due to friction is 25 J + 60 J = 85 J Note that gravitational acceleration used is 10 instead of 9.8. If you...

  4. Note that friction acts in a direction opposite to the relative motion of the object. That is, friction acts up the slope when the object is moving down the runway. This time, friction and mgsinθ acts in opposite direction. As the runway is friction...

  5. ...i388.photobucket.com/albums/oo325/loyitak1990/Sep10/CrazyEM2.jpg Note : It is rather to relate the induced e.m.f. with the displacement...

  6. ...can i find the friction that exerts when the block is moving? Note the angle the inclined plane makes with the horizontal, say t. The...

  7. ...moter drive will draw up 95 x pi x 65 / 60 = 323.2 mm of rope per second. Note that there are 4 pieces of rope pulling the load, hence if the...

  8. ...normall, we have: 20 cos 30 cos 60 = mg cos 60 cos 30 mg = 20 Thus m = 2. Note : Even the blocks are moving with acceleration, the ...

  9. ... is anti - clockwise ( from right to left). 2013-02-28 08:29:51 補充: Note : All currents in mA, since resistances are...

  10. This is a question of relative velocity. Note that velocity is a vector. Perpendicular...d ─── (1) Now, for the man travels down the stream, the velocity of the man relative to the earth = a...