QUIZ 1- CH 12 - FLUIDS |

READ CHAPTER EXAMPLES AS NEEDED. A QUICK SURVEY OF FLUIDS
~ DENSITY: 1 ; WATER PRESSURE: 9; BUOYANT
FORCE: 25, 26, 27 ; BERNOULLI'S LAW: 41, 44.. |

SOMETIMES THE HINTS (INDICATED BY "HINT POSTED" TAG) ARE
ALREADY POSTED AT nvaphysics.com with the LECTURE NOTES,
Exercise
12.2 is for 2 point(s)
Exercise
12.1 is for 2 point(s)
Exercise
12.9 is for 2 point(s)
Exercise
12.21 is for 2 point(s)
Exercise
12.25 is for 2 point(s)
HINT POSTED
Exercise
12.26 is for 2 point(s)
HINT POSTED
Exercise
12.27 is for 2 point(s)
HINT POSTED
Exercise
12.30 is for 2 point(s)
Exercise
12.31 is for 2 point(s)
Exercise
12.42 is for 2 point(s)
Exercise
12.41 is for 2 point(s)
Exercise
12.44 is for 2 point(s)
Exercise
12.48 is for 2 point(s)
Problem
12.86 is for 2 point(s)
HERE'S A HINT TO #86 (a). YOU WANT TO GET
dP = differential change in pressure IN THE RADIAL direction
(along r) and then integrate. The
inward force
along r on a differential ring of mass dm is dF = dP*2*pi*r*dh,
where r is the inner ring radius , pi = 3.14...., and dh is
the differential height of the ring. Note dF = dP*d(area),
where the differential area = d(area) = 2*pi*r*dh. But dF =
dm*v^{2}/r = centripetal force on differential ring
of radius r. NOTE: dm = (density)*2*pi*r*dh*dr, where
density = density of fluid. Note: v^{2} means speed
v squared. THUS, dP*2*pi*r*dh = (density)*2*pi*r*dh*dr*v^{2}/r.
THUS dP/dr = (density)*v^{2}/r. FINISH PROOF WITH
THE SUBSTITUTION: w*r = v.
Problem
12.54 is for 2 point(s)
For the torque we have an integral above and also below
the axis shown by dot:
Problem
12.94 is for 2 point(s)
Problem
12.74 is for 2 point(s)
The mass measured on scale is due to the mass of (A) beaker, (B) the liquid in beaker and (C) the force from the. pressure exerted by the block on the fluid below
it. 7.50 kg = M_{b }+M_{L }
+ (fluid density* V, where V =
0.0038 m^{3} . THE LAST TERM COMES
FROM THE BUOYANT FORCE: SINCE THE BUOYANT FORCE IS THE
FORCE OF WATER ON BLOCK, THE WATER PUSHES ON
BLOCK WITH A FORCE OF THIS SAME MAGNITUDE, WHICH
IN TURN PROVIDES THE ADDITIONAL PRESSURE DOWNWARD BY
BLOCK ON BOTTOM MASS SCALE. Find the
fluid density and all other requested quantities from this information. |