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  1. Natural disasters tell us that we should concern about environmental protection and resources conservation.It also tells...

  2. 1. The question concerns about action and reaction forces. Patrick needs to exert a force to...

  3. ... is also incorrect. C is correct because it is concerning about the magnitude. D and E are incorrect. 10. It is...

  4. ... of reasons. The ICRC had, to some extent, valid concerns about a possible rivalry between both organizations. The foundation of the...

  5. ...the former is a measurement on an object's amount of movement and the latter concerns about energy. By the second law, rate of change of momentum over time is...

  6. Taking moment about Y, we have: Anti-clockwise moment = 450 x 2.5 = 1125 ...zero. 2010-12-25 19:55:04 補充: When any two moments about the same point are NOT balanced with each other...

  7. It is just the same for fusion. The energy supplied to melt a substance is mainly used in increasing the potential energy of molecules when changing from the solid to liquid state. In applying the First Law of...

  8. ...try to answer it generally: For all electrical devices, you can not only concern voltage. You should also know about the current requirement, power consumption, d.c. or a.c., etc... Normally a battery...

  9. B. The body will always travel in a straight line. <-- Incorrect A = correct because F=Ma , F= constant, M = constant, a also = constant C = correct , u can imagine the graph , it will be a straight line , (V1-V2)/ t = a...