作者barry800414 (小铭)
看板b98902HW
标题[公告] 普物功课题目
时间Sat Sep 26 20:28:37 2009
应该是chapter 1吧?
38. The SI unit of force ,the kilogram-meter per second squared(kg‧m/s^2)is
called the newton(N) Find the dimensions and the SI units if constant G in
Newton's law of gravitation F= G‧m1‧m2/r^2
50. A circular hole of radius 8.470 X 10^-1 cm must be cut into the front
panel of a display unit The tolerance is 1.0 X 10^-3 cm, which means the
actual hole cannot differ by more than this quantity from the desired radius
,If the actual hole is larger than the desired radius by the allowed tolerance
,what is the difference between the actual area and the desired area of the
hole?
72.A particular company's stock prices vary with the market and with the
company's type of business,and can be very unpredictable ,but people ofen
try to look for mathmatical patterns where they may not belong. Corning is
a material-engineering company located in upstate New York.
Below is a table of price Cornig stock on August 3,for every 5 years from
1981 to 2001 Assume that the price follows a power law : price (in $)=
B t^c where t is expressed in years .
(a)Evaluate the constants B and C (see methods suggested for the previous
problem )
(b) According to the power law ,what should the price of Corning stock have
been on August 3,2000? (It was actually $ 82.83!)
(a)price (dollars) 2.10 4.19 9.14 10.82 16.85
(b)Years since 1980 1 6 11 16 21
74.You and a friend are out hiking across a large flat plain and decide to
determine the height of a distant mountain peak,and also the horizontal
distance from you to the peak (Figure 1-19). In order to do this,you stand
int spot and determine that the sightline to the top of peak is inclined at
7.5度(我不会打度= =)above the horizontal You also make note of the heading
to the peak at that 13度 east of north. You stand at the original position,
and your friend hikes due west for 1.5km . He then sights the peak and
determines that its sightline has a heading of 15 度 east of north.
How far is the mountain from your position ,and how high is its summit above
your position?
图我没办法了
话说我推荐在系馆放一本给没买的人抄题目
每次打不是办法@@(虽然好像可练英打= =)
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.112.241.197
1F：推 sunjw:哇 早知道就不用抄这麽辛苦 XD 09/26 20:32
2F：推 s864372002:我用手机照起来orz 09/26 20:33
3F：推 rod13824:楼上後来不是用打的吗? 09/26 20:33
4F：推 s864372002:抱歉不小心断了XD 09/26 20:33
5F：推 jeannatte:我和一楼抄的手都快断了orz 09/26 20:39
6F：推 peteranny:推原po超热心QQ 09/26 21:30
7F：→ barry800414:有人可以告诉我第二题的意思吗= =...看不懂 09/26 21:36
※ 编辑: barry800414 来自: 140.112.241.197 (09/26 21:49)
8F：推 shelly61628:也可以每次把题目照起来XD(见下面) 09/26 23:22
9F：→ shelly61628:www.wretch.cc/album/album.php?id=shelly61628&book= 09/26 23:23
10F：→ shelly61628:13 (断成两行了..= =") 09/26 23:24
11F：→ sunjw:抄到快断才想到用打的 XD 09/26 23:27
12F：推 andy860106:楼上上 可以缩网址吧。。。 09/27 00:56
13F：推 erodora:佛心来着 09/27 16:45
14F：推 asdfghjkl202:这不推就看得没良心啦XDD！ 09/27 20:37
15F：推 tim199980:感谢感谢 09/27 20:54
16F：推 s864372002:72的"methods suggested for the previous problem"是. 09/27 21:23
17F：→ s864372002:难道在71题@@? 09/27 21:23
18F：推 paul112004:就在71题中：将y=Bt^C两边取log，观察其graph以解B、C 09/27 21:31
19F：→ paul112004:（有错烦请指正） //50题问的是面积差吗？ 09/27 21:32
20F：推 s864372002:(回楼上：是的) 09/27 21:37
21F：推 paul112004:感谢楼上！ 09/27 21:42
22F：推 asdfghjkl202:可是72提算出来数据差好多喔?? 09/27 23:01
23F：推 andy88566y:0度空间里有tipler 09/27 23:20
24F：推 alex800826:0.001695是四位有效数字喔~ 09/28 08:11
25F：推 davll:72应该要看计算过程 09/29 23:24