作者lemonace (Lentha)
看板b97902HW
标题Re: [问题] 单班物理作业......
时间Sun Sep 28 22:32:38 2008
※ 引述《fishead1116 (2D平面鱼)》之铭言：
: 第3章的第70题看不懂耶
: 有英文强者可以翻译一下吗?
: 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(以上是题目叙述)
脉冲星是中子星星并会放出X射线和其他辐射使地球依照他们的转速而收到固定间隔的辐射
，有些的间隔更只有一毫秒。蟹状脉冲星在猎户星座蟹状星云中正以33.085毫秒周期自转
。据估计它的赤道半径为15公里，恰为一般中子星的平均。
: (a) What is the value of centripetal acceleration of an object on the surface
: at the equator of the pulsar?
(a)一个在此脉冲星赤道表面的物体的向心加速度为多少?
: (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)许多脉冲星都被观测到周期渐渐增加，称为"spin down"。蟹状脉冲星的减缓率为
3.5*10(-13次方)秒度 每秒，也就是如果依照这样减慢率，它将会在9.5*10(10次)秒(大
约3000年以後)停止自转。一个在这脉冲星赤道表面的物体的切线加速度是多少?
粗糙翻译，有错还请强者更正 #)
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◆ From: 140.112.214.202
1F：→ martinku:推专业 09/28 22:46
※ 编辑: lemonace 来自: 140.112.214.202 (09/28 23:05)
2F：→ lemonace:求救.. 查了好久还是不知道s per second那段的意思 >/+ 09/28 23:56
3F：推 fishead1116:感谢解答 s per second那段我确定没打错 09/29 00:27
4F：推 fishead1116:第一题是用a=4π^2*r/T^2 吗? 算出来好大 09/29 10:23
5F：→ lemonace:似乎有听到别的学生问这题 老师提到用科学记号表示 09/29 10:27
6F：→ lemonace:~~~~~也可能全是幻觉~~我当时只是刚好经过 没听很清楚 09/29 10:30
7F：推 sn6783:Xs per second 是不是指每秒周期减缓X秒啊？ 09/29 13:25
8F：推 ewan7954:今天经过听到有人在问....原来减缓率的s是角度.......... 10/01 13:07
9F：→ ewan7954:所以就是每秒减缓3.5*10^(-13)/3600弧...妈的害我卡好久 10/01 13:08
10F：推 tempTTP1:减缓率和切线加速度有关吗? 10/01 17:15
※ 编辑: lemonace 来自: 140.112.214.202 (10/01 19:31)
11F：→ lemonace:ewan好耳力 <^~ (拍拍 10/01 19:34