求解🙏

(A) (8,0) (B) (-8,0) 答案C (C) (4,0) 25. 在光滑水平面上有一質量為2.0千克的物體以4.0米/秒速度向東運動,若受 4.0 牛頓·秒向北衝量作用時,分裂為等質量的兩塊,其中一塊以3.0米/秒向 東運動,則分裂後之總動能為若干?。 答 25 焦耳 2 MI

求解🙏

18.質量50kg的媽媽與質量20kg的兒子,分別由長度8.0m質量130kg之平臺車 的兩端,自靜止起,走到臺車中央相遇後,媽媽把兒子抱起來繼續走,最後停 在臺車之另一端,若一切阻力可忽略,則此臺車移動的路程共為: (A)1.5m (B)2.0m(C)0.75m (D)2.75m(E)3.5m 答案 B

求解第三題🙏

2. 有一門大砲質量為M,在光滑水平面上將質量為m砲彈以速度v水平射出, 求:(1)若砲身可自由後退,則彈射出後,砲身後退速率若干? (2)此系統質心速度若干? (3)若砲座固定,則砲彈射出速率變為若干?(Hint. 動能公式K= = mv²) 2

求解🙏

11.自地面往上空射出一物,升至最高點時離地h;若在此時爆裂為質量相等之兩 塊,且其中一塊再往上升達高度;不計空氣阻力,且重力加速度大小為g,求 另一塊落地之速率為何? (A)↓gh (B)/2gh (C)/3gh (D)/5gh (E)↓6gh 答案 C

想問為什麼人的速度還需要加上船的速度？

9.將質量為 m 之人靜立於質為M之船上,船靜浮於水上,船與水間無摩擦。若人 以相對於船之水平速度Vr跳離船,則船之末速為: mV mV, mV, (M-m)V, (A) r (B) (C)- (D) (E) M 答案A (M+m) (mtM)x0 = m (Vr+ VA) + MVA (M-m) M mV. (M-m) 。 ⇒ VA = mVr 1 mt

不會

The store 1. Jenny: Have you Alice: No, I 2. Roger: David: mopped (mop) the floor? have two hours. 3. Linda: Has the rain stopped Kevin: Yes, it's (a) 4. Teddy 5. Nancy: Are the dogs Peter: No, they aren't. 6. Bill 7. It takes more has Tom played the new video game? ? stopped. (wake) up by the phone call this morning. washed (wash) by Betty every week? (not finish) making the sky lantern yet. He's still working on it. (much) time to write a poem than read one. 8. Jimmy: Where did you meet Sara last time? (meet) her at the airport. We Cathy: I years. 9. Watching the movies on TV costs 10. Making snowmen is as interested 3 (not see) each other for (little) than going to the movies. (interest) as throwing snowballs.

不會

The store 、填空 1. Jenny: Have you Alice: No, I 2. Roger: David: two hours. 3. Linda: Has the rain stopped Kevin: Yes, it's (a) 4. Teddy 5. Nancy: Are the dogs Peter: No, they aren't. 6. Bill 7. It takes (mop) the floor? has Tom played the new video game? ? stopped. (wake) up by the phone call this morning. (wash) by Betty every week? Lesson 3 67 (not finish) making the sky lantern yet. He's still working on it. (much) time to write a poem than read one. 8. Jimmy: Where did you meet Sara last time? (meet) her at the airport. We 3 (not see) each other for Cathy: I years. 9. Watching the movies on TV costs 10. Making snowmen is as (little) than going to the movies. (interest) as throwing snowballs.

請問22題為什麼是C?

三右」/ 道」/ 經濟」: 明指方 衽 山跑 (C) we could pray to gods 20. The cellphone should (A) be left A 21. As soon as I get to Japan, (A) I give (B) it takes another example (D) they scare away attackers out of the bedroom when you go to sleep, or it will affect you (B) has left (C) leave (D) be leaving you a call right away. (B) I'll give (C) I'm giving (D) I've given a lot of fun for me. (C) is (D) are Either reading comic books or watching online movies ACC (A) has to English radio programs every day. That was how I learn 」問 」策 (B) have 23. In my school days, I ** 重造 C English at that time. 戶後 裡 (A) listen (B) have listened (C) used to listen (D) was liste 24. Alice never read the novel, and 451 B (A) so did Leo 25. Susan needs (B) neither did Leo good luck (Q) Leo does, too (D) Leo doe: hard work to become a successful writer.

45題比較級前面不用加the嗎？

friends than his two brothers; he has friends of the three. (A) less; the least (B) more; the most (C) the fewer; fewest (D) fewer; least 45.Josh has B 46. 4) Reading comic books both relaxing () and fun to Alice. (A) is (B) are (C) has (D) have 47. ( ) For Mike, the price is important thing when he shops for jeans. He cares even more about the shane (#) and the size (R+) of the pockets (7) [100 A1 (A) the more

請問3 sleep不是動詞嗎

do ny OMO 0 2. (C) bottom (D) shoulder Alice has a weak stomach, she drinks several cups of strong That is why her stomach is getting worse. (B) When (C) If (D) Though coffee a day. (A) Because 3. Mom: Luke, don't stay up too late. It's 12:00! Luke: But I have a big test tomorrow. Mom: (A) Get enough sleep, and you can do better. (C) To get (B) Gets 4. Bob: What season comes after fall? Tina: Winter. It's the (A) first (C) third (D) Getting season of the year. (B) second (D) last house this