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  1. no, light do not need a medium to travel. In the 19th century, it was believe that light need a medium call "ether" (i think) in order to travel, it was later proof it was not the case. I hope my answer is helpful!

  2. Pilot Does not need to be strong academically, on the other hand... Adult does not allow dual citizenship". 2009-10-31 07:33:29 補充: As you (NO need to use past perfect) said (...

  3. ...fire triangle becomes incomplete and you can not fire. Respiration do not need fuel but need oxygen.It is because oxygen to keep us alive. 2006...

  4. ...work done when a force is applied. If a force is not needed , then there is no work done. Tp push a box forward by 8m, in theory...

  5. ... in zero input. Zero input means that the reactor does not need any external energy input to keep the fusion continue. The main problem of the fusion...

  6. ...由固體轉變為液體,因此它的溫度及粒子勢能是保持不變。 the wax does not need to absorb energy when it melts 這個statement不正確。雖然蠟在溶解時溫度...

  7. 液體與固體間之力,通常我們不會叫摩擦力,通常是叫張力,而油與油之間並無張力,所以很容易移動。其原理是油先以張力依附於固體表面(兩邊都是如此),而兩邊之油層與油層間就能輕易滑動。其實水亦有如此能耐,但因水容易揮發,所以不宜於滑油用途。

  8. ...still experience an acceleration due to gravity. Therefore, parachute is not needed for the landing craft on the Moon. 3. Let the current flow...

  9. ...mutual interaction of electric and magnetic fields. Thus the wave does not need any medium for propagation. Since metals are conductive to electric...

  10. ...quot;they" refer to the particles? In fact, particles do not need to decide for themselves. Remember that the " dual nature"...