問題詳情
2. 一質量為 m 的行星繞著一顆質量為M 的恆星以圓周軌道運轉，當行星速度突然間變成兩倍時；會預期
(A) 行星會脫離恆星系統
(B) 以較小的半徑繞恆星運行
(C) 以較大的半徑繞恆星運行
(D) 維持原來的圓軌道半徑運行
參考答案
無參考答案
內容推薦
- 11 質量為 50 克、溫度為 25℃的未知物質，於密閉容器中和質量為 20 克、溫度為-10℃相同的未知物質混合，達到熱平衡後的溫度為 5℃。已知該未知物質的熔點為 0℃，固態時其比熱為 0 卡
- 【題組】(A) on (B) for (C) over (D) up
- 10 有關熱力學第二定律的敘述，下列何者正確？(A)兩溫度不同的物體相接觸時，熱從低溫處流向高溫處(B)將熱從低溫處送到高溫處，可自然發生，外界無需作功(C)沒有任何熱機，能將熱完全轉換成功(D)熱力
- 小薰很關注最近香港的【反送中運動】，請問，香港是屬於中國的哪類行政區(A)直轄市 (B)自治區 (C)縣 (D)特別行政區
- 【題組】(A) follow (B) following (C) are following (D) is following
- 19 如圖所示之電路，假設二極體為理想，若跨在 C2與 C4串聯上之直流電壓（Vc2+Vc4）為 80 V，則電容 C3跨壓為何？ (A)20 V (B)40 V (C)60 V (D)80 V
- 【題組】(A) in (B) over (C) for (D) from
- 【題組】43) Which is NOT true about Mark’s Easter?(A) He got up early on Easter. (B) He spent the holida
- Allen: Your new watch looks cool! May I take a look? Lynn: Sure. Allen: Wow! Look at the monkey on t
- 【題組】(A) in (B) at (C) with (D) for
內容推薦
- 45~48 The California Gold Rush took place between 1848 and 18During this time gold was found in
- 【題組】Which is true about the “Forty-niners”?(A) They were the first to find gold during the gold
- 【題組】How old is Cindy? (A) (B) (C) (D)
- 【題組】Which is true?(A) San Francisco is one of the boomtowns that turned into an abandoned ghost
- 49~52 Iris: I study and study but I still can’t improve（改善）my grades! I really don’t know to do
- 【題組】45) What may Lynn’s watch look like on May 1? (A) (B) (C) (D)
- 53~55 Sam goes to Peter's home, and they are in Peter's study room now. Sam: Hey, is thi
- 下列各成語或是俗諺選項的敘述中，何者可說明機會成本的概念？(A)學以致用(B)不入虎穴，焉得虎子(C)天生我材必有用(D)穀賤傷農。
- 如圖所示的直流電路，已知 R1 = R2 =R3 = R4 = 150 Ω ，而直流電源為ε = 6 V。當連結在電阻 R4 開關開啟後，則通過R1電阻的電流 (A)會增加為原來的 8/7 倍
- Joe __________ to work, but now he takes the MRT every day.(A) used to drive(B) doesn’t used to dr
- 【題組】Where did people first find gold in California?(A) Bodie. (B) San Francisco. (C) Columbia. (
- 【題組】(A) make (B) making (C) made (D) makes
- 【題組】(A) and (B) but (C) or (D) then
- 【題組】(A) tight (B) possible (C) unusual (D) perhaps
- 【題組】(A) broke (B) broken (C) was breaking (D) was broken
- 【題組】(A) will buy (B) buys (C) bought (D) am buying
- He’s heard that story before, and __________ I.(A) so am (B) so have(C) neither am(D) neither have
- Don’t leave the lights on. Please__________.(A) turn off them(B) turn them off(C) off turn them(D)
- A: Did you know the pop singer is my cousin?B:__________ A: No, I’m not. It’s true.(A) I think
- A: Hi, can you tell me where Taipei 101 is?B: __________ Here is a map on my smartphone.(A) Neithe
- Sam and Peter __________ each other since they were five years old. They are very close friends.(A
- Todd enjoys seeing movies very much, and __________. They often go to the movies together.(A) so i
- Meg: Do the dishes, Ron.Ron:__________It’s your turn.(A) That’s great.(B) Why me?(C) I guess you’r
- I don’t like the pants, and my sister doesn’t,__________.(A) too(B) so(C) either(D) yet
- As long as you finish your homework, we__________ to the park.(A) had gone(B) will go(C) have gone