作者lemonace (Lentha)
看板b97902HW
標題Re: [問題] 單班物理作業......
時間Sun Sep 28 22:32:38 2008
※ 引述《fishead1116 (2D平面魚)》之銘言：
: 第3章的第70題看不懂耶
: 有英文強者可以翻譯一下嗎?
: 附上原文
: Pulsars are neutron stars that emit X rays and other radiation in such a way
: that we on Earth receive pulses of radiation from pulsars at regular intervals
: equal to the period that they rotate. Some of these pulsars rotate with
: periods as short as 1 ms!! The Crab Pulsar ,located inside the Crab Nebula in
: the consellation Orion, has a period currently of length 33.085ms. It is
: estimated to have an equatorial radius of 15km , an average radius for a
: neutron star(以上是題目敘述)
脈衝星是中子星星並會放出X射線和其他輻射使地球依照他們的轉速而收到固定間隔的輻射
，有些的間隔更只有一毫秒。蟹狀脈衝星在獵戶星座蟹狀星雲中正以33.085毫秒週期自轉
。據估計它的赤道半徑為15公里，恰為一般中子星的平均。
: (a) What is the value of centripetal acceleration of an object on the surface
: at the equator of the pulsar?
(a)一個在此脈衝星赤道表面的物體的向心加速度為多少?
: (b) Many pulsars are observed to have periods that lengthen slightly with
: time, a phenomenon called "spin down ". The rate of slowing of the Crab
: Pulsar is 3.5 * 10(-13次方)s per second which implies that if this rate
: remains constant, the Crab Pulsar will stopp spinning in 9.5*10(10次)s
: (about 3000 years from today). What is the tangential acceleration of
: an object on the equator of this neutron star?
(b)許多脈衝星都被觀測到周期漸漸增加，稱為"spin down"。蟹狀脈衝星的減緩率為
3.5*10(-13次方)秒度 每秒，也就是如果依照這樣減慢率，它將會在9.5*10(10次)秒(大
約3000年以後)停止自轉。一個在這脈衝星赤道表面的物體的切線加速度是多少?
粗糙翻譯，有錯還請強者更正 #)
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◆ From: 140.112.214.202
1F：→ martinku:推專業 09/28 22:46
※ 編輯: lemonace 來自: 140.112.214.202 (09/28 23:05)
2F：→ lemonace:求救.. 查了好久還是不知道s per second那段的意思 >/+ 09/28 23:56
3F：推 fishead1116:感謝解答 s per second那段我確定沒打錯 09/29 00:27
4F：推 fishead1116:第一題是用a=4π^2*r/T^2 嗎? 算出來好大 09/29 10:23
5F：→ lemonace:似乎有聽到別的學生問這題 老師提到用科學記號表示 09/29 10:27
6F：→ lemonace:~~~~~也可能全是幻覺~~我當時只是剛好經過 沒聽很清楚 09/29 10:30
7F：推 sn6783:Xs per second 是不是指每秒週期減緩X秒啊？ 09/29 13:25
8F：推 ewan7954:今天經過聽到有人在問....原來減緩率的s是角度.......... 10/01 13:07
9F：→ ewan7954:所以就是每秒減緩3.5*10^(-13)/3600弧...媽的害我卡好久 10/01 13:08
10F：推 tempTTP1:減緩率和切線加速度有關嗎? 10/01 17:15
※ 編輯: lemonace 來自: 140.112.214.202 (10/01 19:31)
11F：→ lemonace:ewan好耳力 <^~ (拍拍 10/01 19:34