Franglais:
. Using 9.8 m/s/s for g and assuming the estimate of 100ft, is correct so 30m drop ?
Weve got these, (but my keyboard doesnt do indices, sorry)
v = v0 + at
s = s0 + v0t + ½at2
v2 = v02 + 2a(s − s0)
Using 2. 30 = 0 + 0t + half 9.8 t.squared (initial position and initial vertical velocity is zero)
30 = half 9.8 t.squared
60/9.8 = t.squared.
t.squared = about 6 so t = about 2.5s.
Using 1. v0 is zero (vertical velocity) ( it doesn`t much matter if you go over the edge slow or fast)
v = 9.8 x 2.5 = about 25m/s (or 25 x 60 x 60 /1000 = 90kph)
Monty Python:
Would that be the airspeed velocity of an unladen swallow carrying a coconut?
It`d be the air speed velocity of a coconut NOT carried by a swallow!
AndrewG:
That barrier certainly looks flimsy, obviously up to the job though. Lucky man…
If he went through it’s approximately 100 ft to either the ground or where he was it would’ve been an ice cold dirty river
The temperature of the water would not have been too high on the list of his worries I`d think?
EDIT.
Using 9.8 m/s/s for g and assuming the estimate of 100ft, is correct so 30m drop ?
Weve got these, (but my keyboard doesnt do indices, sorry)
v = v0 + at
s = s0 + v0t + ½at2
v2 = v02 + 2a(s − s0)
Using 2. 30 = 0 + 0t + half 9.8 t.squared (initial position and initial vertical velocity is zero)
30 = half 9.8 t.squared
60/9.8 = t.squared.
t.squared = about 6 so t = about 2.5s.
Using 1. v0 is zero (vertical velocity) ( it doesnt much matter if you go over the edge slow or fast) v = 9.8 x 2.5 = about 25m/s (or 25 x 60 x 60 /1000 = 90kph) so coincidentally, its the same speed as being on the limiter.
So if that truck went over the edge hed hit the ground at 56mph, about two and a half seconds after leaving the bridge. Bet thatd seem a kin long two nalf seconds though!
A few years back a petrol tanker went through the barriers on m56 near Runcorn.dropped 100 foot and exploded. Dept of transport say those barriers are adequate, bloody was for that tanker and poor driver.
Every time I cross that bridge over the Tay at the A90 near Perth, i look at the railings and imagine there isn’t any kind of barrier.
As, In my opinion there might as well not be.
Not in a heavy anyway.
Bull driver was almost home too , bet he was cursing . Hated that bridge during the rebuild when trucks had to run up the shoulder , clenched every time the wind blew
AndrewG:
That barrier certainly looks flimsy, obviously up to the job though. Lucky man…
If he went through it’s approximately 100 ft to either the ground or where he was it would’ve been an ice cold dirty river
The temperature of the water would not have been too high on the list of his worries I`d think?
EDIT.
Using 9.8 m/s/s for g and assuming the estimate of 100ft, is correct so 30m drop ?
Weve got these, (but my keyboard doesnt do indices, sorry)
v = v0 + at
s = s0 + v0t + ½at2
v2 = v02 + 2a(s − s0)
Using 2. 30 = 0 + 0t + half 9.8 t.squared (initial position and initial vertical velocity is zero)
30 = half 9.8 t.squared
60/9.8 = t.squared.
t.squared = about 6 so t = about 2.5s.
Using 1. v0 is zero (vertical velocity) ( it doesnt much matter if you go over the edge slow or fast) v = 9.8 x 2.5 = about 25m/s (or 25 x 60 x 60 /1000 = 90kph) so coincidentally, its the same speed as being on the limiter.
So if that truck went over the edge hed hit the ground at 56mph, about two and a half seconds after leaving the bridge. Bet thatd seem a kin long two nalf seconds though!
EDIT 2
Feel free to correct any errors I`ve made.
You’re spot on…I was just typing all that as your post popped up so to save a DP I deleted [emoji1]
They are “supposed” the withstand 14 ton hitting it head on . But as that they are hit from an angle the force doesn’t get that high . Didn’t one go of the thelwall a few years ago . Mulgrews comes to mind
