求解

169. A cannon fires a projectile as shown. The dashed line shows the trajectory in the absence of gravity; points MNOP correspond to the position of the projectiole at one second intervals. If g = 10 m/s², the lengths X,Y,Z are: A) 5 m, 10 m, 15 m B) 5 m, 20 m, 45 m C) 10 m, 40 m, 90 m D) 10 m, 20 m, 30 m E) 0.2 m, 0.8 m, 1.8 m M

想請問這四題

98. A baseball is hit straight up and is caught by the catcher 2.0 s later. The maximum height of the ball during this interval is: 4.9 m 2÷2=1 XA) B) C) D) E) 7.4 m 19.4 m 38.8 m 19.6 m 122. DA If the x component of a vector A, in the xy plane, is half as large as the magnitude of the vector, the tangent of the angle between the vector and the x axis is: A) √3 B) 1/2 C) √3/2 3/2 D) E) 3 142. Two vectors lie with their tails at the same point. When the angle between them is increased by 20° the magnitude of their vector product doubles. The original angle between them was about: A - B = |A|| B|cos O 2 L² cose = L² cos (0+20²) 2005 = cos@casso. sing sino A) 0 B) 18° C) 25° D) 45° E) 90° BA 158. Identical guns fire identical bullets horizontally at the same speed from the same height above level planes, one on the Earth and one on the Moon. Which of the following three statements is/are true? A) III only B) I and II only - 0-9 cose-adsint I. The horizontal distance traveled by the bullet is greater for the Moon. II. The flight time is less for the bullet on the Earth. III. The velocities of the bullets at impact are the same. I and III only II and III only 1.1 cos@=-035n9. tant = 1/3 C) D) E) I, II, III h-Vortat² xoxt-txt tu-Jite

物理，能量。C為什麼錯？（功不是力*位移嗎？然後加速度越大F越大->功越大？）

JUA 51 ~ 55 為題組 (EN) 五次会感覺兩到,如風心点消南巴 彬彬和霖霖一起做實驗研究風力發電。兩人設計了一個實驗裝置如附圖,實驗步驟如 SELAMAT BERCERZITES ADO 下: KUEET IS BOLO 步驟1:將扇葉安裝於風車支架的轉軸上,將懸線的一端繫於轉軸處,想吊 NCR CIAL HASIL DA WIRE DRA 樂 以 步驟2:將電風扇置於風車正前方1公尺處,將電風扇的風速按鈕調整至1檔處, 2 SER 碼錶記錄砝碼上升至4點(轉軸處)所需的時間。 步驟3:電風扇位置不變,將風速按鈕調整至2、3、4檔位(檔位愈高,風速愈快) 重複實驗,以碼錶記錄砝碼上升至4點所需的時間。 彬彬將實驗結果記錄成下表,請回答下列問題: 電風扇檔位 1 3 100 克的砝碼。 砝碼質量 砝碼上升至4點所需時間 20 s PEN 100 g 17 s 100g 014 s 100g 100g 10 s OZE 風車模型 風車 支架 扇葉 3% (2) /轉軸 懸線 6砝碼 電風扇

怎麼算🥲

Problem 5 (20 points) The U-tube shown in the figure has unequal diameters of D₁ and D2 and are open to the atmosphere at the top. If an additional volume V2 of the fluid II is added to the right-hand tube, what is the amount of the level at B will fall? Please express your answer in terms of p1, p2, V2, D1 and D₂. Di hA C fluid II fluid I B A D2 hc 4hB Figure 2 The U-tube manometer.

求解E選項 物體運動方向等於位移方向 作負功的話 力與運動方向相反 請問錯在哪裡 謝謝🙏🙏

範例 8 F-x圖與功能定理 如圖所示為某物體在x軸上運動時,其受力F與位移x的關 係圖(F與x的方向平行),下列敘述哪些正確?(應選3項) (A)在0~6m期間對物體作正功 12J (B) 在6~9 m 期間對物體作負功3J (C)在0~9 m 期間對物體作正功9J (D)在x=0時物體為靜止合力為0 (E)在6~7 m 期間力與物體運動方向相反。演 6x4=12 ABCE.. T'SIS PAS -3 F (N) A 4 6 -2 9 -x(m) ME

求解 136、137

D) E) none of these =11 136. Two vectors have magnitudes of 10 and 15. The angle between them when they are drawn with their tails at the same point is 65°. The component of the longer vector along the line of the shorter is: A) 0 B) 4.2 C) 6.3 D) 9.1 E) 14 137. Let S = (1 m)2 + (2 m)j + (2 m) and T = (3 m)2 + (4 m)k. The angle between these two vectors is given by: A) cos ¹(14/15) B) cos ¹(11/225) cos ¹(104/225) cos ¹(11/15) cannot be found since S and 7 do not lie in the same plane 138. Two vectors lie with their tails at the same point. When the angle between them is increased by 20° their scalar product has the same magnitude but changes from positive to negative. The original angle between them was: A) 0

請問這題～第二頁是解答

一、非選圖:920x4:180x31 01 48. 更麼 比#540x 1 如圖所示,A、B兩點相距d,而質點P自A點以v｡初速向 右運動,作加速度a向左之運動,則質點P欲通過B點兩次, 5m/3² FROM 則a之條件為何? ~2020 Vot-fat-zd -30/52 texsti Sho a E Shay% d HOFI Not-d (votel) =1500Vot-d={at 2車百田新出發先以等加浦度5 m/ 行淮至7站,垃苳古北川笔油畫字 B

想問倒數兩行算式為何是這樣算呢

t 日 x(cm) Nex(cm) -x (cm) :40/50 範例 週期波在空間軸與時間軸的重複性 相關題型:單元練習 11、15、16. 已知一正弦週期橫波在x軸上傳播,在坐標原點O 的質點之振動位移y對時間t的關 係圖如圖(一)所示,t=0的波形圖像如圖(二)所示,則t = 0.5 s 時刻的波形圖像可能是下 一個波4m. 列何者?(多選) y(m) 0.45. y(m) (A) (D) -3-2-1 0.5 pes /0.3. 10.1 cof y wh "AA" A AT. 1 3 这 0123 23 -t (s) x emm (B) X (E) 解題關鍵▶由空間軸看出波長,由時間軸看出週期。 答 週期: 04s ^ = 4 m. 0.55 - 工 4 AAA Ad the 01 2 T 2 &T=5m x 3 2345 (C) x -x(m) x 5mia cises V: 3d By:10

想請問這題怎麼解

4-10題為選出 BEL 某質點作等加速直線運動,過 4 點時速度為 15m/s,再經 6.0s 通過 B 點,AB 相距 180m, CAP 14.物體的加速度量值為多少m/?? (A)2 (B)3.5(C5(D)6(E)8。 (V)IS (B)50 (C)eo (D)8+ (E)130

想問m/s與ms的差別在哪裡呢？

TOYU 21. 海上靜止的船隻,發出聲波以偵測魚群位置,經過 50 ms 測 得聲波的回聲訊號,且發 現回聲的頻率下降。若當時海中聲波速率為1520 m/s,則下列何者為該魚群在反射 波時,其相對於船隻的距離與運動狀態? - 聲 -7 +X 12 21 fish to 5 ms (B)相距 76m,接近中 (C) 相距 38 m,遠離中 (E)相距 76m,相對靜止。 (A)相距 38 m,接近中 (D) 相距 76 m,遠離中 〔104學測,答對率59%〕