W***n
发帖数: 11530 | 1 A) A 3500lb Benz travelling 30mph hitting head on a 2500lb Civi travelling
30mph.
B) A 2500lb Civi hitting travelling 46.5mph head on a rigid steel-concrete
wall.
Which case you think the driver of the Civi will suffer most? |
W***n
发帖数: 11530 | 2 Mind you, this's orange to orange, apple to aaple.
EQUAL amount of impact energy. |
h********n
发帖数: 117 | |
i****x
发帖数: 17565 | 4 宁可坐在奔驰里死，也不愿意坐在刺猬里残
【在 W***n 的大作中提到】
: Mind you, this's orange to orange, apple to aaple.
: EQUAL amount of impact energy.
|
W***n
发帖数: 11530 | 5 May be I should re-word the question:
A) A 3500lb car X travelling 30mph hitting head on a 2500lb car Y travelling
30mph.
B) A 2500lb car Y hitting travelling 46.5mph head on a rigid steel-concrete
wall.
Which case you think the driver of car Y will suffer most? |
n****y
发帖数: 968 | 6 当然是B。。A中两车都有缓冲，相当于在B的墙上加了海绵，B中所有的撞击都集中在一
个车上。。就算是B也是30mile,还是B受伤厉害 |
W***n
发帖数: 11530 | 7 Your selection is correct but your explanation is not accurate &
professional enough. |
W***n
发帖数: 11530 | 8 C'mon, you don't need PhD in crash mechanics to answer this question
satisfactory. a |
m********y
发帖数: 32 | 9
A- V'=((2500-3500)*30)/(3500+2500)=-5
2500*(30-(-5))=2500*35
B- 2500*46.5
A
B suffer more.
动量守恒
Best wishes.
【在 W***n 的大作中提到】
: Your selection is correct but your explanation is not accurate &
: professional enough.
|
r******o
发帖数: 1530 | |
l****g
发帖数: 5080 | 11 原来的高中生可以解决的物理问题，现在小孩子们学习都超前了，是不是初中就可以解
决了？
答案楼上已然有了。简单的物理。 |
l*****k
发帖数: 284 | 12 why do people have to make such a choice?
you do not buy a car to do head-on collision every day. a sturdier car
cannot guarantee your safety in every collision.
buying a sturdier car is just a form of insurance. but a dollar goes to this
form of insurance, is a dollar less in another form, lets say you prepare
for an earthquake. |
