t***l
发帖数: 3644 | 1 1. You are in a rowing boat on a lake. A large heavy rock is also in the
boat. You heave the rock overboard. It sinks to the bottom of the lake. What
happens to the water level in the lake? Does it rise, fall or stay the same?
2. You are provided 2 unequal lengths of rope and told that both take
exactly 1 hour to burn from end to end, although they don’t necessarily do
so in a uniform fashion. How would you go about measuring an exact 15 minute
period? |
t***l
发帖数: 3644 | 2 第二题注意是15分钟，我在想是不是只要一根绳子就够了：每时每刻都让绳子有四个头
在烧（剪成两段出现四个头，如果有一段率先烧完，把没烧完的再剪成两段），直到全
部烧完。
What
same?
do
minute
【在 t***l 的大作中提到】
: 1. You are in a rowing boat on a lake. A large heavy rock is also in the
: boat. You heave the rock overboard. It sinks to the bottom of the lake. What
: happens to the water level in the lake? Does it rise, fall or stay the same?
: 2. You are provided 2 unequal lengths of rope and told that both take
: exactly 1 hour to burn from end to end, although they don’t necessarily do
: so in a uniform fashion. How would you go about measuring an exact 15 minute
: period?
|
d*j
发帖数: 13780 | 3 两个绳子先烧三个头， 第一个绳子烧完 get 30 min
开始第二个绳子的最后一头， 得到 15 min
【在 t***l 的大作中提到】
: 第二题注意是15分钟，我在想是不是只要一根绳子就够了：每时每刻都让绳子有四个头
: 在烧（剪成两段出现四个头，如果有一段率先烧完，把没烧完的再剪成两段），直到全
: 部烧完。
:
: What
: same?
: do
: minute
|
t***l
发帖数: 3644 | 4 看清题目哦，不是要45分钟，是要15分钟。你的做法得先等30分钟哦。
【在 d*j 的大作中提到】
: 两个绳子先烧三个头， 第一个绳子烧完 get 30 min
: 开始第二个绳子的最后一头， 得到 15 min
|
d*j
发帖数: 13780 | 5 ok
hehe
【在 t***l 的大作中提到】
: 看清题目哦，不是要45分钟，是要15分钟。你的做法得先等30分钟哦。
|
D*******a
发帖数: 3688 | 6 http://www.amazon.com/Would-Move-Mount-Microsofts-Puzzle/dp/0316919160
What
same?
do
minute
【在 t***l 的大作中提到】
: 1. You are in a rowing boat on a lake. A large heavy rock is also in the
: boat. You heave the rock overboard. It sinks to the bottom of the lake. What
: happens to the water level in the lake? Does it rise, fall or stay the same?
: 2. You are provided 2 unequal lengths of rope and told that both take
: exactly 1 hour to burn from end to end, although they don’t necessarily do
: so in a uniform fashion. How would you go about measuring an exact 15 minute
: period?
|
t***l
发帖数: 3644 | |
s*********y
发帖数: 689 | 8 第一个问题，答案是水面将会下降。
What
same?
do
minute
【在 t***l 的大作中提到】
: 1. You are in a rowing boat on a lake. A large heavy rock is also in the
: boat. You heave the rock overboard. It sinks to the bottom of the lake. What
: happens to the water level in the lake? Does it rise, fall or stay the same?
: 2. You are provided 2 unequal lengths of rope and told that both take
: exactly 1 hour to burn from end to end, although they don’t necessarily do
: so in a uniform fashion. How would you go about measuring an exact 15 minute
: period?
|
D*******a
发帖数: 3688 | 9 your brain teasers are all covered in the book
these are fairly old ones
【在 t***l 的大作中提到】
: ？？？
|
t***l
发帖数: 3644 | 10 是不是因为：扔下水后石头挤走的水，不如石头重？
【在 s*********y 的大作中提到】
: 第一个问题，答案是水面将会下降。
:
: What
: same?
: do
: minute
|
r*******s
发帖数: 303 | 11 你就想像石头的密度是无穷，体积就是0.
所以船要浮起来，水面自然下去了。
【在 t***l 的大作中提到】
: 是不是因为：扔下水后石头挤走的水，不如石头重？
|
