Ninety percent of light incident on a certain piece of glass passes through it. How much light passes through two pieces of this glass?
A) 80%
B) 81%
C) 85%
D) 89%
E) 90%
Answer: B
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This is negative throughout the region, therefore, T(y) is concave down throughout the region and the temperature at y = 1.6 mm is indeed the maximum temperature. These calculations are verified by the graph of T(y). Inserting ymax into the expression for T(y) yields: Tmax = T(0.00161 mm) = 48.8°C.
GIVEN
A journal bearing
Diameter (D) = 100 mm = 0.1 m
Clearance (H) = 0.5 mm = 0.0005 m
Rotational speed (@) = 3600 rpm
Oil properties
? Density (p) = 800 kg/m3
? Viscosity (?) = 0.01 kg/ms
? Thermal conductivity (k) = 0.14 W/(m K)
Temperature of bearing surface (Tb) = 60°C
FIND
(a) Temperature distribution in the oil film
ASSUMPTIONS
Steady state
Uniform and constant bearing surface temperature
Constant fluid properties
The journal surface is insulated (negligible heat transfer)
SKETCH
A brass bar twisted by torques T acting at the ends has the follow- ing properties: L 5 2.1 m, d 5 38 mm, and G 5 41 GPa. The torsional stiffness of the bar is approximately:
(A) 1200 N?m
(B) 2600 N?m
(C) 4000 N?m
(D) 4800 N?m
The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.
A mineral can be composed entirely of one element.
a. true b. false