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91esa04 - 80 4 1 2B 4 1 1 A 300N weight 5m long rigid...

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Fig 1 高雄㊩㈻大㈻㈨㈩㆒㈻年度㈻士後㊩㈻系招生考試試題 科目:普通物理㈻ 考試時間: 80 分鐘 共 4 頁第 1 頁 說明:㆒ . 選擇題用 2B 鉛筆在「答案卡」㆖作答,修正時應以橡皮擦拭,切勿使 用修正液 ( ) ,未遵照正確作答方法而致無法判讀者,考生㉂行負責。 . 試題應隨同試卷繳回,不得攜出試場。 選擇題 ( 選題, 題答 4 分,答 錯倒扣 1 分,未作答者,不 ) 1. A 300N weight, 5m long rigid uniform ladder is leaning against a smooth vertical wall. A 750N weight man stands on a rung 4m up along the ladder from its base as shown in fig.1. What is the minimum coefficient of the statical friction between the ladder and the floor required to keep the system in equilibrium? The angle is 53.1 ° on a horizontal beam. ( cos 53.1 ° = 0.6, sin 53.1 ° = 0.8 ) (A) 0.22 (B) 0.42 (C) 0.46 (D) 0.54 (E) 1.90 2. An imaginary closed surface S of radius R is centered on the origin. A positive charge is originally at the origin, and the flux through the surface is Φ e . The positive charge is slowly moved from the origin to a point R/2 away from the origin. Now the flux is . (A) 4 Φ e (B) 2 Φ e (C) Φ e (D) Φ e /2 (E) Φ e /4 3. An incompressible fluid flows through a horizontal pipe. At one point in the pipe the pressure in the fluid is p 1 and the fluid speed is v 1. Further down the pipe pressure is p 2 and the fluid speed is 2v 1 . What can be concluded about p 1 and p 2 ?
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