[題目] 有關於摩擦和功率的問題
[領域]
物理
[來源]
考古題
[題目]
第一題
Which of following is correct,
(a) the friction of ice on ice depends on both temperature and sliding speed.
At low temperature (-40°C), the static coeficient is 0.45 and drops as
temperature rises
(b) When a bicycle is pedaled the bottom of rear wheel is pushed forward
against road
(c) The phenomenon of Stick-Slip occurs when the relative speed of the
sliding surfaces is high and when one of the objects cannot vibrate
(d) force of friction is proportional to load and contact area
(e) the force of static friction opposes the tendency of block to move
relative to the surfaces. Kinetic friction occurs when both surfaces and
block are weIded
第二題
同重量兩車，在十秒鐘由靜止加速，A車可達60公里/小時，B車可達
120小時/公里，B車與A車的輸出馬力比值為多少？
第三題
軌道速度
太空中兩物體分別以r及4r(距地心距離)軌道繞地球運行，在雷達螢幕上，速度比為多少?
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※ 編輯: taigoinwo 來自: 210.240.195.183 (03/06 18:40)
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