1 Problem I
2.11.4
V=[ - l w k
CEE 3500 - Sample Exam No. 5 (TEST 1) - Fall 2005
A flat plalc 200 mm x 750 mm slidcs on oil ( p = 0.85 N . s / d ) ovcr a largc planc
surface (Fig. X2.11.4).What force F is required to drag the plate at a velocity v
of 1.2 d s . if the thickness f of the separating oil film is 0.6 mm?
17
-
/t= 0 ~ 2 ~ F 8 . % " '
3 0.[5
m2.
Figure XZ.11.4
(
Problem 2
2.71
,
1
f = ~ h - =PT
+
Oil
Plate
F, v
VA
I
Determine the pressure difference between points A and B in Fig. 2-51
26c*
, Kqrosene,
" s =' 0.88q
Fig. 2-51
I
Problem 3
3.41
In Fig. 3-33. gate A S is 5 f t widc ilnd opcns to let frcsh water out when the ocean tide is dropping. The hingc nt
A is 2 It above thc lrcsh walcr Icvcl.
t--'
I
I Problem 4
A
Determine the horizontal and vertical components of force acting o n radial gate ABC in Pip. 5-33u and thcir
lincs of action. What force Pis required to open the gate (neglecting the weight of the gate)?