Hi there, I am working my way through some past exam papers and am stuck on this question, the answer that was given to me with the past exam was wrong so I have no reference, I cannot find anywhere on the net or in books the type of cct I am trying to design.
In previous parts of the...
having a look thrugh a textbook it turns out that I am not sure what is correct.
the book says E=1/2mv^2+1/2Jw^2 = E=1/2mv^2+1/2mk^2*w^2
please comment
Homework Statement
when a car has traveled 100m up a 1 in 10 (sine slope) the driver stops and has a drink, he places an empty can of cola on the ground so that it can roll, the can weighs 50g and the radius of rotation k of the can is r
a, calculate the energy of the can at the top and...
thats great! I can now see what the method is for this type of question, would I be able to get just a few more mins of your time, could you explain why I had to differentiate and set it to 0?, I know the distance formula was used to get the closest point of the 2 vectors and the result of this...
hi,
I attempted to solve by completing the square but it all went a bit crazy.
got it to
33.56t^2-918.88t+211085.1=217482.7
I do not know how to convert the left hand side to square form, the times I have done this before I could just see the answer.
I am not sure how to solve...
good morning
I have woken up now and am fresh minded and raring to go.
distance^2 = (1.49t-30.61)^2 + (5.6t -73.9)^2
D^2= 33.56t^2-918.88t+6397.57
where to now?
do I sqrt the right hand side?
ah yes, my silly mistake, it is getting late here now
distance^2 = (1.49t-30.61)^2 + (5.6t -73.9)^2
==d^2 = 1.49t^2-2*1.49t*30.61+-30.61^2 + 5.6t^2-2*5.6t*-73.9+-73.9^2
= d^2 = 1.49t^2-91.2t+936.9 +5.6t^2+827.7t+5461.21
=d^2 = 7.09t^2+736.5t+6398.11
is this right so far?
I...
d^2=1.49^2*t^2-30.61^2+-73.9^2-5.6^2*t^2 =
d^2=2.22*t^2-936.9+-5461.21-31.36*t^2 =
d^2 = -6427.25*t^4
not sure I have done that right beacuse the answer should be positive,
I can't see where the sign is wrong