往kindle fire或者其他tablet里拷电影方便吗 - 未名空间MITBBS历史存档

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往kindle fire或者其他tablet里拷电影方便吗

往kindle fire或者其他tablet里拷电影方便吗# PDA - 掌中宝

P*b2011-12-05 08:12

1 楼

puzzle - 2 trains traveling in opposite direction, bird starts from one and
reaches other and flies back and forth like this till train collide. Find th
e time taken to collide, total distance traveled by the bird, and no. of tim
es bird makes a U turn.

j*i2011-12-05 08:12

2 楼

俺们加州城里人这次就放过你了，不跟你比了

c*t2011-12-05 08:12

3 楼

打算买个tablet 往里面考电影得方便才行像itunes就又慢又麻烦还有对格式有啥要
求吗/

s*t2011-12-05 08:12

4 楼

V_tr = the speed of trains
V_b = the speed of bird
S = the initial distance between two trains.
The time to collide t = S/(2*V_tr)
The total distance of bird = V_b*t
The distance between the two trains when the bird makes the first U turn is:
S1=S-2*S*V_tr/(V_tr+V_b)=S*(V_b-V_tr)/(V_tr+V_b)
let r=(V_b-V_tr)/(V_tr+V_b)
The distance between the two trains when the bird makes the second U trun is:
S2=S1*r=S*r^2
So the number of times bird makes a U turn is m, where
S*r^m < size(a bird)
This should

【在 P*******b 的大作中提到】

: puzzle - 2 trains traveling in opposite direction, bird starts from one and
: reaches other and flies back and forth like this till train collide. Find th
: e time taken to collide, total distance traveled by the bird, and no. of tim
: es bird makes a U turn.

l*d2011-12-05 08:12

5 楼

偶的神呀，你不知道现在是农忙时间，这么乱挖坑，东一锹、西一锹的。

x*a2011-12-05 08:12

6 楼

kindle fire容量一共6gb左右。你打算拷多少？

h*k2011-12-05 08:12

7 楼

the number of bird making u-turn should be infinite.
The distance bird flying each time is a sequence becoming closer to 0 and
can not reach 0 if time and distance can be divided infinitely.

is:
is:

【在 s*****t 的大作中提到】

: V_tr = the speed of trains
: V_b = the speed of bird
: S = the initial distance between two trains.
: The time to collide t = S/(2*V_tr)
: The total distance of bird = V_b*t
: The distance between the two trains when the bird makes the first U turn is:
: S1=S-2*S*V_tr/(V_tr+V_b)=S*(V_b-V_tr)/(V_tr+V_b)
: let r=(V_b-V_tr)/(V_tr+V_b)
: The distance between the two trains when the bird makes the second U trun is:
: S2=S1*r=S*r^2

i*o2011-12-05 08:12

8 楼

看起来像是地老鼠挖的，坑都不大，有连贯性

【在 l*********d 的大作中提到】

: 偶的神呀，你不知道现在是农忙时间，这么乱挖坑，东一锹、西一锹的。

g*a2011-12-05 08:12

9 楼

如果没这点用户自由，Android能这么火么。
拷文件是你的自由，能不能放就看Player的本事了。我的部分4.7G大小的720P MKV文件
硬解没问题。

s*t2011-12-05 08:12

10 楼

isn't this a typical mistake of limit?

【在 h**k 的大作中提到】

: the number of bird making u-turn should be infinite.
: The distance bird flying each time is a sequence becoming closer to 0 and
: can not reach 0 if time and distance can be divided infinitely.
:
: is:
: is: