Physics For Civil Engineering: Unit I: Thermal Application
Assignment Problems with Answers
Thermal Application | Physics For Civil Engineering
Physics For Civil Engineering: Unit I: Thermal Application: Assignment Problems
ASSIGNMENT PROBLEMS
1. A copper rod 19 cm long and of 0.785
cm area of (10 cross-section which is thermally insulated is heated at one end
to 100°C while the other end is kept at 30°C. Calculate the amount of heat that
will flow in 10 minutes along the way. K of copper is 380 Wm-1 K-1
(Ans.
6.594 kJ)
2. Two bars of copper and steel of
length 1.0 m and 0.5 m respectively and of coefficient of thermal conductivity
400 W m-1K-1 and 50 W m-1 K-1
respectively are joined end to
end.
The free ends of copper and steel are
maintained at 100°C and 0°C respectively. Calculate the temperature of
copper-steel junction if both bars have the same area of cross-section.
(Ans.
80°C)
3. Calculate the thickness of the slab
of area 85 x 10 m through which 8 joules of heat is flowing through the
opposite faes maintained at a temperature difference of 30 K. The coefficient
of thermal conductivity of the material of the slab is 0.05 W m-1 K-1
.The time taken for the heat flow is 10 seconds
(Ans. 0.0159 m)
4. Equal bars of copper and aluminium
are welded end to end. If the free ends of copper and aluminium are maintained
at 150°C and 0°C respectively. Find the temperature of the welded interface.
Assume the thermal conductivity of copper and aluminium to be 386.4 W m-1
K-1 and 210 W m-1 K-1 respectively.
(Ans. 97.183 °C)
5. A slab consists of two parallel
layers of different materials 4 cm and 2 cm thick and of thermal conductivity 226.8
W m-1 K-1 and 150.2 W m-1 K-1 respectively.
If the opposite faces of the slab are at 100°C and 0°C. Calculate the
temperature of the surface dividing the two.
(Ans.
316 K or 43°C)
6. The outer ends of two bars A and B
(inner ends of which joined together by welding) are at 100°C and 50°C
respectively. Calculate the tempearature at the welded joint if they have the
same cross section and the same length and their thermal conductivity are in
the rate A:B = 7:5. (AU, April 2016)
(Ans:
79.16° C)
Physics For Civil Engineering: Unit I: Thermal Application : Tag: : Thermal Application | Physics For Civil Engineering - Assignment Problems with Answers
Physics For Civil Engineering: Unit I: Thermal Application
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Physics for Civil Engineering
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