問題詳情
六、An airship is lo operate at 20 m/s in air at standard conditions (the pressure is 101 kpa). A model is constructed lo 1/20 scalc and tested in a wind tunnel at Ihc same air Icmpcralurc lo determine the drag. What criterion should be considered lo obtain dynamically similarity ? If the model is tested at 75 m/s, what pressure should be used in the wind tunnel ? If the model drag forcc is 250 N, what will be the drag of the prototype ? (25%)
參考答案
無參考答案
內容推薦
- 下列各項敘述,何者正確?(A)職位分類制以利來鼓勵人(B)品位分類制較適於專才(C)職位分類制類科職等劃分較少(D)職位分類制以人為中心
- ()下列哪一個Word—般工具列中的圓示可以預覽列印？(A) (B) (C) (D)
- 9 令 z 與 w 為複數，下列敘述何者錯誤？(A) (B) (C) (D)
- (20%) Suppose Lhat the T-account for First Nalional bank is as follows:【題組】(1)If Ihe central bank
- ()下列何種類型的檔案無法用Word將其正常開啟？(A)*.bmp(B) * txt(C)*doc(D)*.htm。
- Find the volume uiuler the surface= xe -y over the region which is Ijouiuledby curves y = 1 — x2,
- 下列何者非屬郵政法之立法目的？(A)增進公共利益(B)提供普遍、公平、合理之郵政服務(C)健全郵政發展(D)促進產業創新
- ( ) Internet 是採何種通訊協定？(A) X. 25 (B)ISO 的 OSI (C) TCP/IP (D) HDLC。
- A motorcycle shop estimates that it will soil 750 motorbikes in a year. Eacli biko cost $300, plus
- 五、PrattCorporation sold its 8% bonds with a maturity value of $ 1，0003000 on May 13 2008， for $950,2
內容推薦
- 颱風過後，蔬菜漲價，其供需變動情形爲何？(A) (B) (C) (D)
- 【題組】b.冰箱的舊機換新機策略
- 一架飛機以速度360 km/hr沿水平圔圈飛行 ＞ 如圖(2) ,機翼和水平交角45度’問此圓半徑多少？（其飛 行所需的力,爲垂直機翼的一連續的空氣動力所提供的升力） 15%
- 四、請應用線積分（逆時針方向）及應用Greentheorem in the plane求解 C為四頂點為(0，0 )，(2，0)，(2，3)，及「0,3」之矩型週邊。(25%)
- 【題組】比較甲乙丙冰三隻試管濃度大小?(A)甲＞乙＞丙=丁 (B) 丙=丁＞甲＞乙 (C)丙=丁＞乙＞甲(D)甲＞乙＞丙＞丁
- 試說明何謂流體力學的正應力'剪應力與壓力？上述三種力何者係被用 來區分流體與固體？其原因為何？
- 【題組】(b)Find the potential at the center, using infinity as the reference point. (10%)
- 如下圈於Excel的A1儲存格，顯示3400元。問該储存格之資料為可能為那兩種資料型態？ 如何輸入及設定使其成為該兩種資料型態？
- 【題組】(c)Now the outer surface is touched to a grounding wire.How do you answers to (a) and (b) change
- 【題組】(c)Find the energy stored in a section of length 1 of the solenoid. (5%)
- 【題組】(b)Prove that A =
- 【題組】(b)Use the result from (a) to find the electric field at p. (10%)
- A “pure” dipolep is situated at the origin, pointing in the z direction.【題組】(a)What is the force o
- At the interface between one linear magnetic material and another magnetic field lines bend (see F
- (16%)(i)Evaluate the double integral
- 【題組】(ii)Compute(6%)
- For the conditions shown, respond to the following questions and statements concerning application
- 【題組】(b)What is the force on Q at (0, 0, a)? (6%)
- 以客觀的態度，研究經濟現象的事實與因果關係是屬於(A) 實證經濟學(B) 規範經濟學(C)個體經濟學(D) 總體經濟學
- 【題組】(b)What is the rank of A?
- A square loop of wire (side a) lies on a table, a distance s from a very long straight wire, which
- 【題組】(c)How much work does it take to move Q from (a, 0，0) to (0，0, a)? (6%)
- 【題組】A拿了一杯100公克、10℃的開水，B了一杯100公克、20℃的開水，兩人於杯中加入30公克的黑糖，發現兩杯杯底均有沉澱，設混和過程中無溫度變化，根據表中所提供的數據，關於兩人所拿的溶
- Find the following limits. (15%)【題組】(1)
- 7(10%)【題組】 (a) Find