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halosh92:
i found this in the syllabus:
-''Show an understanding of the origin of the upthrust acting
on a body in a fluid''

what does that mean???

-''Recognise that, for a perfectly elastic collision, the relative
speed of approach is equal to the relative speed of
separation''

and could someone briefly explain this and give an example, how are the questions diiferent from the normal m1u1 +m2u2=m1v1 + m2v2
??????? :-[ :-\

astarmathsandphysics:
The first one is Archimedes principle. The upthrust is equal to the weight of fluid displaced and for the second one mass is not involved.  http://www.astarmathsandphysics.com/a_level_maths_notes/M2/a_level_maths_notes_m2_restitution_momentum_collisions.html

ruby92:
but the As syllabus doesn't include the restitution principle
V of approach=V of seperation..so v1+u1=v2+u2

ruby92:
the ultimate tensile stress is a point before the fracture/breaking point.where the materia "gives" or "yields'??
is this right?

Saladin:
Yes, that is right.

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