問題詳情
3.某個作用於剛體(rigid body)的力 
，該力對於作用點 O 的位置向量(position vector)是 
， 
與 的夾角是θ ，點 O 至該力向量的垂直距離是 d，下列何者為錯誤的力矩(moment)表示？
(A) 
(B) 
(C) 
(D) MO = Fd
參考答案
無參考答案
內容推薦
- The percentage of the human genome that encodes proteins is approximately(A) 90 %. (B) 70 %. (C)
- Which of the following is an example of polygenic inheritance?(A) skin pigmentation in humans (B
- All of the following are reasons why gas exchange is more difficult for aquatic animals than it
- Where is the attachment site for RNA polymerase?(A) operator region (B) initiation region(C) str
- Hypophosphatemia is inherited as an X-linked dominant. A woman without hypophosphatemia and a ma
- Birds are like their reptile ancestors, but their bodies are highly modified for flight. Which o
- Why do the kidney’s activities require large amounts of energy?(A) Filtration requires high bloo
- The plasma cell is specialized for the production and secretion of antibodies, and thus contains
- Living in a group confers what advantage on an animal?(A) access to mate (B) increased ability t
- How are the action potentials of pacemaker cells spread to other cardiac cells?(A) via cardiac i
內容推薦
- The nuclear envelope breaks down at the end of(A) S phase. (B) G2 phase. (C) prophase. (D) metap
- Which of the following substances is incorrectly matched with its producer?(A) aldosterone--kidn
- A long-day plant will flower if(A) it is kept in continuous far-red light.(B) the duration of co
- Which of the following may explain genomic imprinting?(A) post-translational modification of pro
- The repeated use of insecticides may lead to the evolution of insecticide resistance in insects.
- Differentiation of teeth is greatest in(A) reptiles. (B) mammals. (C) bony fishes. (D) sharks. (
- Archaeopteryx(A) was a transitional form between birds and mammals.(B) had feathers and had no t
- Genetic variation is the result of all but(A) the role of environment in controlling genetic exp
- Biomes are(A) recognized on the basis of the dominant animal life.(B) all of the populations of
- The first plants arose during the __________ era.(A) Cenozoic (B) Mesozoic (C) Paleozoic (D) Pre
- Which of the following statements about movement corridors is true?(A) A movement corridor conne
- Which of the following combination is correct?(A) Porifera – coelomate, branch radial.(B) Nemato
- Consider a field plot containing 200 kg of plant material. How many kg of carnivore production c
- A person suffering from AIDS would be unlikely to suffer from which of the following diseases?(A
- The vascular system of a three-year-old dicot stem consists of(A) 3 rings of xylem and 3 of phlo
- Within the female gametophyte, three mitotic divisions of the megaspore produce(A) the triple fu
- Which of the following is correctly paired?(A) forebrain – diencephalons (B) midbrain – cerebell
- A pathogenic fungus invades a plant. Which of the following does the plant produce in response t
- The most common pattern of dispersion in nature is(A) random. (B) uniform. (C) indeterminate. (D
- Which of the following statements is false?(A) Estuaries support many semiaquatic species.(B) Ma
- Which of the following is true in the logistic model of population growth?(A) as N approaches K,
- Which of the following does not have a coefficient of relatedness of 0.5 in humans?(A) a brother
- The population cycle of the snowshoe hare and its predator indicates that(A) predators are not t
- 圖四為三國鼎立形勢圖，請問：以下何者正確？(A)三國立國的先後順序為甲→乙→丙(B)三國鼎立的局面和赤壁之戰有關(C)三國亡國的先後順序為乙→丙→甲(D)司馬睿結束了三國以來的分裂局面。
- Which of the following statements about endocrine system is false?(A) Hormones from the adrenal