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  1. friction and power

    ... calculating power, we are intended to measure the " action " power. If we take the reaction into account, it will result in the conservation of energy, always zero balance...

    分類：科學及數學 > 其他 - 科學 2009年03月24日

  2. physics

    ...ii) Average speed = Total distance travelled / total time taken = 100 / 13.6 = 7.35m/s ( cor. to 3 s.f. ) b) The speed of B after...

    分類：科學及數學 > 其他 - 科學 2007年11月18日

  3. 問中四phy

    ... average power as follows: Time of action of the man's force = 3.16 s Velocity of the...10 × 10 sin 30° = 500 J Work done against friction = 10 × 10 = 100 J So total energy output...

    分類：科學及數學 > 其他 - 科學 2007年06月26日

  4. newton s third law

    ... such, he needs to exert some force against this [resistance force] in order to continue ...the ground. Imagine if you take the [man and box] as a [system], then the action -reaction pair mentioned above becomes...

    分類：科學及數學 > 其他 - 科學 2008年07月29日

  5. 大象為什麼會被殺

    ...clear that these parks may be the elephant's last hope against the rapidly changing world around them. ...mostly due to international and local pressure. Without action , it is predicted that the elephant population in...

    分類：科學及數學 > 其他 - 科學 2007年03月28日

  6. Electricity

    ... mechanical stress. Triboelectricity: electric charge taken on by contact or friction between two different materials...transmit information by electrical impulses known as action potentials.

    分類：科學及數學 > 其他 - 科學 2007年07月21日