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物理 高中

想問第一題答案C是是怎麼出來的 為什麼這題不能用動量守恆解? 謝謝!

一、單選題:每題8分,共48分 ) 1.在撞球遊戲中,給白球一個初速率00,撞上一組靜止的15個色球後,全部16個球 經歷多次的球與球及球與邊的碰撞,一段時間後,測出某瞬間全部16個球的速率 0均相同,求v為若干?(假設16個球質量皆相同,所有碰撞均為彈性碰撞且不考 xve mVo+mx0x16 m+mith 1674 慮球的轉動,球檯質量視為無限大) (A) Vo 2 (D) (B) 10 (C) 20 Vo 15 (E)16 4 (C)2. 試依據下圖所示的條件,判定A、B兩球之正向碰撞是屬於哪一類型的碰撞? P A B A B 8m/s O- 2m/s---O 10kg 20kg (A)完全彈性碰撞 (B)完全非彈性碰撞 (D)非完全彈性碰撞 (E)資料不足無法判斷 2 ☆動量守恆 20:5 8x10 = -2x10+xx20 84 8x10=-2x10+Xx20 15 (C)非彈性碰撞 ) 3. 如右圖所示,一個內壁光滑的圓柱筒容器,高度h=20m,直徑 d=4 m。一顆小球從圓柱頂端A處沿直徑方向水平射出,在B 處和器壁產生無能量損失的完全彈性碰撞後被彈射回來,如此往 復彈射整數次後落到容器底部,設水平射出的初速度為v=10 2設重力加速度g=10m/s²) (E) 6 10=54+10+=+20+-10号 目撞離地高:202号-210 A球V撞=20-x10=16=B' B A v=10m/s >0==gt mt=2 4m=19mx 20m 1-5 6 5 x=5 撞」課程中所學,兩等質量物體進行彈碰會發生速 實驗進行操作與測量。她們分別取得同質量的A、 20m/s鉛直上拋,同時千媳則將B球擺置在A球 2.設兩球在空中作要向彈8 4m

已解決 回答數: 1
英文 高中

想問第9題 dedicate為什麼用vpp

Angela Duckworth, an American scholar, gave a TED Talk in New York entitled "Grit: The Power of Passion and Perseverance." The ideas in her talk were later made into a book with the same title, 3. was published in 2016. 4. years earlier, Duckworth accepted a job as a mathematics teacher at a public school in New York. Her talk details how 5. the years, her students gradually taught her that to be successful, natural intelligence alone is not enough. One must also possess what is known 6. grit. Grit refers to consistent effort 7. by a strong determination to achieve a goal. Through detailed research, Duckworth discovered that people with high levels of grit remain highly motivated to achieve their goals 8.giving up on them. In other words, someone with true grit will see himself or herself getting closer to his or her goal day by day. Therefore, that person will always be able to keep himself or herself achieving that goal. 团 重 9. 10. Her book Duckworth's TED Talk and book have since inspired millions remained on The New York Times' bestseller list for almost half a year following its publication. (C) 1.(A) what (B) which (C) how (D) why (B) 2.(A) so (B) such alne (C) very (D) same (A) 3.(A) which (B) it (C) that U (D) and (D) 4.(A) Few (B) Little) (C) A little (D) A few (5.(A) with (B) around (C) until (D) over (C) 6. (A) by (B) for (C) as (D) to be (B) 7.(A) drives (A) 8. (A) instead of CB) (A) dedicate B 10. (A) in turn (C) on their way (B) driven (B) regardless of (B) dedicating (C) driving (D) to drive (C) except for (C) dedicated (D) in addition to (D) to dedicate (B) around the world 興 Ho (D) around the corner

已解決 回答數: 1
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