問題詳情
3. 如右圖所示，小木塊質量為m，沿無摩擦之翻圈軌道滑行，若木塊在P點初速√gR沿軌道下滑，則木塊在A點時（高度為2R），木塊作用於軌道之力為何？ 
(A)5mg
(B)4mg
(C)3mg
(D)2mg
(E)mg。
(A)5mg
(B)4mg
(C)3mg
(D)2mg
(E)mg。
參考答案
答案：D
難度：非常困難0
統計：A(0),B(0),C(0),D(0),E(0)
內容推薦
- 臨床上，口腔黏膜的顏色最不受下列何種因素影響？(A)黏膜發炎狀態(B)上皮層厚度(C)上皮角化程度(D)黏膜下方肌肉層之有無
- 如圖所示，小明手持米尺，使米尺下端零點位於小華拇指與食指之間。小華一看到小明鬆手，就立即抓握米尺，結果米尺落下 0.8 公尺。若重力加速度為 10 米／秒2，則小華的反應時間約為多少秒﹖ (A)0
- The math teacher told us to draw two h l lines, not vertical ones.
- VIII翻譯題 10%She has never traveled abroad because she doesn’t like taking plane. (請用neither合併兩句)
- 下列何種口腔黏膜，每單位面積黏膜中，含有最多數目的結締組織乳頭（connective tissuepapillae）？(A)頰黏膜（buccal mucosa）(B)唇黏膜（labial muc
- 將物由遠處逐漸靠近凸透鏡，則成像變化之情形為何？(A)倒立縮小實像倒立放大實像正立縮小虛像(B)倒立縮小實像倒立放大實像正立放大虛像(C)正立放大虛像倒立放大實像倒立縮小實像(D)倒
- 我們很興奮這間多功能的體育館讓我們在室內運動，而且它也提供了聚會(assemblies) 的場地。
- The d ns of the painting are 35 by 45 centimeters.
- She accepted her husband’s death with____ (serene), trusting that he was now in God’s hands.
- 在多根牙牙根分岔處（furcation）之牙釉珠（enamel pearls）常常造成細菌侵入與牙周清潔不易，最後造成牙周破壞（periodontal destruction）；此牙釉珠的形成主
內容推薦
- 下圖所示為顳顎關節（temporomandibular joint）矢狀切面在顳骨關節隆突（articulareminence）的組織學表現，①②③所標示的三層組織構造依序是：(A)纖維軟骨（f
- 一質量為 60 公斤的人，手持 10 公斤的球，乘坐在一質量為 30 公斤的車子上，車子在平直光滑軌道上以 3 公尺／秒的速率前進。如將球沿車行方向水平拋出，球拋出瞬間相對於人的速率為 10 公
- 【題組】(A) fall in love with (B) lose sight of (C) call for(D) head for
- 【題組】(A) Otherwise (B) As a result (C) In addition (D) Therefore
- Many colleges offer f______l aid to students who cannot afford the tuition.
- 【題組】(A) clichéd (B) comical(C) natural (D) promising
- 【題組】(A) helplessly and hopelessly (B) painfully and sorrowfully(C) sick and tired (D) cold and s
- Dr. Lee is in d______r because of the sudden death of his wife and son in the air crash.
- 【題組】(A) Both . . . and (B) Not only . . . but also(C) Either . . . or (D) Neither . . . nor
- (2) Mickey Mouse has a potbelly and a squeaky voice. His arms and legs are ___56___ sticks. He has n
- V. Cloze ( 15%)每題 1 分(1) Dr. Frankenstein created a monster. The creature, unfortunately, wasn’t the
- VI. Reading Comprehension (5%)(A)EmilyDickinson, one of the greatest poets in the English language,
- 【題組】(A) bring back to (B) bring upon (C) rise above (D) drive to
- 某電路連結如圖所示，其中電池的電壓為，且電池內電阻為0，若將電阻R2增大，則下列哪一個選項是流過RR2和R3的電流變化情形：
- The teacher has devised various teaching activities to make her English class more s___ing.
- 【題組】Which of the following is closest in meaning to “secluded”?(A) successful (B) alone (C) lege
- 【題組】(A) when (B) that (C) who (D) what
- 【題組】(A) wander (B) wandering (C) wandered (D) to wander
- Don't just c___e. We need some constructive and practical suggestions.
- 【題組】Which of the following is NOT true about Emily Dickinson?(A) Fewer than a dozen of her poems
- 【題組】(A) how (B) which (C) why (D) where
- 設某石階，每階高 20cm，寬 30cm，一石子自頂階邊緣被以 5m/s的水平初速踢出，則自被踢出至抵達某低階歷時約（重力加速度 g＝10m/s2） (A) 0.28(B) 0.35 (C) 0.
- Even though the writer insists that the plot of this book is i____y, the readers believe it is s
- As a boy, you look r____s in the funny-looking dress.
- (3) Shel Silverstein is famous for his magical power to bring laughs and joys to his readers.61 , be