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  1. ================================= 圖片參考:https://s.yimg.com/rk/HA05107138/o/2072600647.png

    分類:科學及數學 > 數學 2014年12月08日

  2. Here is an example of the cooling system for CPU used in desktop computers 圖片參考:http://i256.photobucket.com/albums/hh182/zilu_photo/65.jpg http://i256.photobucket.com/albums/hh182/zilu_photo/65.jpg in all industry, the processing unit for all...

  3. ...fraction of their overall area. And this area is in proportion to the normal force ( surface pressure x total contact area). So, Coulomb friction depends only...

  4. 其實呢句主要係想否定d人對 normal reaction的誤解.. 可以改變 normal reaction的因素大概只有g的改變同mass的改變.. 而唔係depends on個touching surface 既area.. 至於同friction既關係.. 一同物體在無external force既情況之下.. 要產生friction...

  5. ... height of B) = √4 : √1 = 2 : 1 (2) true (Curved surface area of A) : (Curved surface area of B) = 2² : 1²...

    分類:科學及數學 > 數學 2015年01月04日

  6. ...6 N (b) Suppose the pulling force magnitude = F, then: Normal reaction of the surface on the block = mg - F sin 30 = mg - F/2 (F sin 30 being...

    分類:科學及數學 > 化學 2009年02月05日

  7. for this kind of question, we should divide the weight into 2 componenets one is paralle to the inclined road (mg sin10)and the another one is prependicular to the inclined road (mg cos10) for the friciton, as it is acting in the direction that is parallel to the...

  8. " Normal incidence" means the incident ray is perpendicular to the incident surface . In other words, the angle of incidence is zero degree.

  9. ... surfaces is influenced by the coefficient of friction between the surfaces in contact, the normal reaction force, the radius of curvature of the rolling object, and its deformability...

  10. 你的老師是對的。而磨擦(friction)與接觸面( surface area)有關係一般人的謬誤。 磨擦力是與接觸面無關係...物理,物理知識貧瘠得可憐。 磨擦是與物體的法向力( normal reaction)成正比(directly proportional)。Friction條式如下...