HEAT+MASS TRANSFER (LL)-W/ACCESS
6th Edition
ISBN: 9781265879631
Author: CENGEL
Publisher: MCG CUSTOM
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Chapter 1, Problem 16P
Consider a 150-W incandescent lamp. The filament of the lamp is 5 cm long and has a diameter of 0.5 mm. The diameter of the glass bulb of the lamp is 8 cm. Determine the heat flux in W/m2 (a) on the surface of the filament and (b) on the surface of the glass bulb, and (c) calculate how much it will cost per year to keep that lamp on for eight hours a day every day if the unit cost of electricity if $0.08/kWh.
FIGURE P1-16
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1.5 (A). A simple turnbuckle
arrangement is constructed from a 40
mm outside diameter tube threaded
internally
at each end to take two rods of 25 mm
outside diameter with threaded ends.
What will be the nominal stresses set
up
in the tube and the rods, ignoring
thread depth, when the turnbuckle
cames an axial load of 30 kN?
Assuming a
sufficient strength of thread, what
maximum load can be transmitted by
the turnbuckle if the maximum stress
is
limited to 180 MN/mz? C39.2, 61.1
MN/m2, 88.4 kN.1
1.3 (A). Define the terms shear stress
and shear strain, illustrating your
answer by means of a simple sketch.
Two circular bars, one of brass and
the other of steel, are to be loaded by a
shear load of 30 kN. Determine the
necessary diameter of the bars (a) in
single shear, (b) in double shear, if the
shear stress in the two materials must
not
exceed 50 MN/m2 and 100 MN/
mZ respectively. C27.6, 19.5, 19.5,
13.8mm.l
11
1.4 (A). Two forkend pieces are to be
joined together by a single steel pin of
25mm diameter and they are
required to transmit 50 kN. Determine
the minimum cross-sectional area
of material required in one branch of
either
fork if the stress in the fork material is
not to exceed 180 MN/m2. What will be
the maximum shear stress in the pin?
C1.39 x 10e4mZ; 50.9MN/mZ.]
10:41
Chapter 1 Solutions
HEAT+MASS TRANSFER (LL)-W/ACCESS
Ch. 1 - How does the science of heat transfer differ from...Ch. 1 - What is the driving force for (a) heat transfer,...Ch. 1 - How do rating problems in heat transfer differ...Ch. 1 - What is the difference between the analytical and...Ch. 1 - What is the importance of modeling in engineering?...Ch. 1 - When modeling an engineering process, how is the...Ch. 1 - On a hot summer day, a student turns his fan on...Ch. 1 - Consider two identical rooms, one with a...Ch. 1 - Prob. 9CPCh. 1 - Prob. 10CP
Ch. 1 - Prob. 11CPCh. 1 - An ideal gas is heated from 50C to 80C (a) at...Ch. 1 - What is heat flux? How is it related to the heat...Ch. 1 - What are the mechanisms of energy transfer to a...Ch. 1 - A logic chip used in a computer dissipates 3 W of...Ch. 1 - Consider a 150-W incandescent lamp. 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What...Ch. 1 - Consider a house in Atlanta, Georgia, that is...Ch. 1 - Prob. 120PCh. 1 - A 4m5m6m and room is to be heated by one ton (1000...Ch. 1 - Engine valves (cp=440J/kg.Kandp=7840kg/m3) are to...Ch. 1 - Prob. 123PCh. 1 - Prob. 124PCh. 1 - A 0.3 -cm-thick, 12-cm-high, and 18-cm-long...Ch. 1 - A 40-cm-long, 800-W electric resistance heating...Ch. 1 - It is well known that wind makes the cold air feel...Ch. 1 - An engine block with a surface area measured to be...Ch. 1 - Prob. 129PCh. 1 - Prob. 130PCh. 1 - Prob. 131PCh. 1 - Consider a person standing in a room maintained at...Ch. 1 - Prob. 133PCh. 1 - Prob. 134PCh. 1 - Prob. 135PCh. 1 - Prob. 136PCh. 1 - Prob. 137PCh. 1 - Prob. 138PCh. 1 - Prob. 139PCh. 1 - Prob. 140PCh. 1 - Prob. 141PCh. 1 - Prob. 142PCh. 1 - A 2-kW electric resistance heater submerged in...Ch. 1 - Prob. 144PCh. 1 - A cold bottled drink (m=2.5kg,cp=4200J/kg.K) at...Ch. 1 - Prob. 146PCh. 1 - Air enters a 12-m-long, 7-cm-diameter pipe at 50oC...Ch. 1 - Prob. 148PCh. 1 - Steady heat conduction occurs through a...Ch. 1 - Heat is lost through a brick wall (k=0.72W/m.K),...Ch. 1 - Prob. 151PCh. 1 - A 40-cm-long, 0.4-cm-diameter electric resistance...Ch. 1 - Prob. 153PCh. 1 - Prob. 154PCh. 1 - Over 90 percent of the energy dissipated by an...Ch. 1 - On a still, cleat night, the sky appears to be a...Ch. 1 - Prob. 157PCh. 1 - Prob. 158PCh. 1 - A persons head can be approximated as a...Ch. 1 - A person standing in a room loses heat to the air...Ch. 1 - Write an essay on how microwave ovens work, and...Ch. 1 - Using information form the utility bill for the...Ch. 1 - It is well know that at the same outdoor air...
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