Homework Statement
Hi, VERY URGENT and I am so confused
Find the efficiency of the optimum trebuchet.
Optimum trebuchet Specs:
Counterweight= 5kg
Sling Length= 78cm (laid out fully)
Length from fulcrum to load= 44cm
Length from fulcrum to counterweight=16cm
Height the weight drops...
If i add the vectors of 15m and 15.8 m i get :
unknown distance after crash if crash didnt happen= √(15^2 + 15.8^2)
= 21.79m
then if i add that to the initial braking distance:
= 21.79 + 15
= 36.79m
and use that in u= √(2mugs)
u= √(2*0.6*9.8*36.79)
u= 20.8ms-1
u= 74.9kmh-1
the...
:O i think this MIGHT be it!
If i add the vectors of 15m and 15.8 m i get :
unknown distance after crash if crash didnt happen= √(15^2 + 15.8^2)
= 21.79m
then if i add that to the initial braking distance:
= 21.79 + 15
= 36.79m
and use that in u= √(2mugs)
u= √(2*0.6*9.8*36.79)...
i just had an idea, is this what you meant ehild...do you think that if i could find the extra amount of distance the 4WD would have traveled if it didnt crash into the car, then added that to the braking distance of 15m and then used the u= √(2mugs) rule that it might work? I am just trying to...
thanks!
do you mean by using the initial speed formula?
u= √2mugs
u=√(2*0.6*9.8*15)
u= 13.28ms-1
its the wrong answer if that's what you meant because 15m isn't the whole distance the 4WD would have taken to stop as it crashed before it could...but do you think that if i could...
i thought that's what i did...i used vecor addidtion like this (see attachments) but can't i just use pythag to get the initial momentum, then divide that by the 4WD's mass? because its a right angle..i tried your way with the x and y components but i just got the same answer as what i got...
Thanks for replying! =D but I am not sure i know what u mean exactly, i realize that Pi=Pf but I am not sure what to do with the angles you mentioned:
im guessing something to do with vector addition possibly taking in the angles? or with kinetic formulas?... could you explain a little more...
How can i get an initial speed without acceleration or time??
Homework Statement
Hi..heres the problem:
A 4WD traveling East has collided with a stationary car, the 4WD's skid marks are 15m long until the point of collision. The 4WD is sent 35degs South for 15.8m and the car is sent...
if anyone thinks this question can't be done please say so so i havnt got my hopes up...but it should be, others have got the answer, i just have no idea how to get it.. iv spent ages on it..:(
Homework Statement
Hi..heres the problem:
A 4WD traveling East has collided with a stationary car, the 4WD's skid marks are 15m long until the point of collision. The 4WD is sent 35degs South for 15.8m and the car is sent 55degs North for 15m. The car has a mass of 1150kg and the 4WD's is...