b***k
发帖数: 2673 | 1 Suppose there is an infinite straight beach and there is a lighthouse 1 mile
offshore. The light rotates at 1 revolution per minute. How fast is the
image of the beam on the beach, i.e. the "white dot", moving along the beach
when that white dot is exactly 3 miles from the lighthouse? |
d*j
发帖数: 13780 | 2 from morgan stanley ?
look at heard on the street ........ |
b***k
发帖数: 2673 | 3 got you, thanks for reminder. I felt like I had seen this one before.
【在 d*j 的大作中提到】
: from morgan stanley ?
: look at heard on the street ........
|
g******e
发帖数: 352 | 4 是不是等于 0.3 pi (mile/sec) ?
谁能公布一下正确答案？
【在 b***k 的大作中提到】
: got you, thanks for reminder. I felt like I had seen this one before.
|
b***k
发帖数: 2673 | 5 18*pi miles/min
【在 g******e 的大作中提到】
: 是不是等于 0.3 pi (mile/sec) ?
: 谁能公布一下正确答案？
|
