ahhhhhhhhhhhhhhhhhhhhhhhh(STrESSED entry)
FLUID EXAM ANAYSIS!!( DO NOT READ!! UNLESS YOU'RE REALLY BORED)
TOMORROW FLUIDS TEST FREAK!!! I don't have the paper to practise cos SEE TOOK MY PAST YR PAPER AWAY and reading it off the SCREEN hurts my EYES!! and you have to sCRoll UP SCroll down.. !!STUPID SEE!!
OKay RElaX La, There are only so many questions the eXamIner Can Come out lor.
~Dimensional Analysis.
For the chance that TTLIM decides not to have 25 MCQ for Qn1 we'll have a short Dimensional Analysis QuEstion, Come on How tough can it get, At most we have to pick our own variables,
say density, dynamic viscosity, length velocity are always in, If it's a rotational question, we'll just throw in omega for rotational speed for good measure.
Equilibrum of moving fluids.
Don't think it'll come out cos the last 2 yr come out liao. And it's done simply by substituting equations of Z=(w^2r^2)/2g + z and Conservation Of Mass equation.. okay.. --> WONT COME OUT ONE LA
Analysis of pipe Flow.
I suspect he might use this since it has not surfaced for the last 2 yrs. PLUS He delibrately teaching us how to read the moody diagram during the last lecture. So we have to use relative roughness and Re to find Friction factor. hmm..
At most, at most he'll be kind and say neglect minor losses, leaving us only to deal with friction losses. Plus having to use Bernoulli's eq for an inviscid, incompressible fluid. to find the Q or something. or some Ratio..(80% will come out)
Momentum and application.
fReak, this has got to be the easiest application yet hard to see ever! !Using Qout= Qin or Min= Mout then F=(mVfinal-mVinitial)
Maybe he'll give us a control vol then ask us to find the reaction force or something. Still it's not that hard.( maybe will come out)
Surface tension.
Hmm I don't think this question will come out.It's simply done by equation Surface tension force upwards and downward total vol..(nah wont come out)
Hydrostatic thrust on a submerged plane
This is a bit tricky. but I think he'll set a question on this one Finding Centre of thrust/ pressure and then taking moments to solve some reaction force.(70% will come out)
Stability of a floating body
Not difficult unless that guy decides to use some weird ass shape as the floating body.
equating Upward mass of vol displaced= downward weight of object
Buoyancy point is just centroid of submerged body
CG of object is at it's centroid
for stability GM>0
for an added mass -->change in distance cg aka shift in cg = ( (Distance of new mass from CG)(new mass) )/ ( old mass + new mass)
then to get new cg add distance change of cg to old cg. Must be in the same direction of course.
BM is just I/vol displaced( high chance will NOT come out)
Continuity equation.<--------WILL COME OUT QN4!!
I think this will definitely come out. Students do not have any idea what the continuity equation is!! it's just mass in = mass out. But to put that in integral form is int(Uin)dA= Int(Uout)dA
Then he'll come out some GOD MODE question in which only people who come from up north(no not woodlands think further... ) will know how to ans. Then he'll incoporate some shear stress shit, assuming linear velocity profile(We ALWAYS Assume linear velocity profile) to find the shear force = Shear stress * area acted upon
With tat said.. phew.. I'm sTILL STRESSED !! WHAT IF I DUNNOE HOW TO DO! SCREAMSS
WTF THE WCG IS OVER!!!!!!!!!!SIGHZ
TOMORROW FLUIDS TEST FREAK!!! I don't have the paper to practise cos SEE TOOK MY PAST YR PAPER AWAY and reading it off the SCREEN hurts my EYES!! and you have to sCRoll UP SCroll down.. !!STUPID SEE!!
OKay RElaX La, There are only so many questions the eXamIner Can Come out lor.
~Dimensional Analysis.
For the chance that TTLIM decides not to have 25 MCQ for Qn1 we'll have a short Dimensional Analysis QuEstion, Come on How tough can it get, At most we have to pick our own variables,
say density, dynamic viscosity, length velocity are always in, If it's a rotational question, we'll just throw in omega for rotational speed for good measure.
Equilibrum of moving fluids.
Don't think it'll come out cos the last 2 yr come out liao. And it's done simply by substituting equations of Z=(w^2r^2)/2g + z and Conservation Of Mass equation.. okay.. --> WONT COME OUT ONE LA
Analysis of pipe Flow.
I suspect he might use this since it has not surfaced for the last 2 yrs. PLUS He delibrately teaching us how to read the moody diagram during the last lecture. So we have to use relative roughness and Re to find Friction factor. hmm..
At most, at most he'll be kind and say neglect minor losses, leaving us only to deal with friction losses. Plus having to use Bernoulli's eq for an inviscid, incompressible fluid. to find the Q or something. or some Ratio..(80% will come out)
Momentum and application.
fReak, this has got to be the easiest application yet hard to see ever! !Using Qout= Qin or Min= Mout then F=(mVfinal-mVinitial)
Maybe he'll give us a control vol then ask us to find the reaction force or something. Still it's not that hard.( maybe will come out)
Surface tension.
Hmm I don't think this question will come out.It's simply done by equation Surface tension force upwards and downward total vol..(nah wont come out)
Hydrostatic thrust on a submerged plane
This is a bit tricky. but I think he'll set a question on this one Finding Centre of thrust/ pressure and then taking moments to solve some reaction force.(70% will come out)
Stability of a floating body
Not difficult unless that guy decides to use some weird ass shape as the floating body.
equating Upward mass of vol displaced= downward weight of object
Buoyancy point is just centroid of submerged body
CG of object is at it's centroid
for stability GM>0
for an added mass -->change in distance cg aka shift in cg = ( (Distance of new mass from CG)(new mass) )/ ( old mass + new mass)
then to get new cg add distance change of cg to old cg. Must be in the same direction of course.
BM is just I/vol displaced( high chance will NOT come out)
Continuity equation.<--------WILL COME OUT QN4!!
I think this will definitely come out. Students do not have any idea what the continuity equation is!! it's just mass in = mass out. But to put that in integral form is int(Uin)dA= Int(Uout)dA
Then he'll come out some GOD MODE question in which only people who come from up north(no not woodlands think further... ) will know how to ans. Then he'll incoporate some shear stress shit, assuming linear velocity profile(We ALWAYS Assume linear velocity profile) to find the shear force = Shear stress * area acted upon
With tat said.. phew.. I'm sTILL STRESSED !! WHAT IF I DUNNOE HOW TO DO! SCREAMSS
WTF THE WCG IS OVER!!!!!!!!!!SIGHZ
kakashi + 5:55 PM
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