Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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3.
6.0" wide wooden fence posts are embedded in a concrete driveway a distance 12.125" apart. There is
a 1/16" gap between the post and the concrete (see diagram). The posts are installed when the temperature is
12°C. Determine if the gap will close when the temperature increases to 32°C and if not how big the gap will
be at that temperature. The thermal expansion coefficients of wood and concrete are awood =32 x 105 °C and
aconcrete =13 x 106 °C. 1 inch3D2.54 cm.
6.0"
12.0"
0.0625"
A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.4 m x 1.9 m. On a certain day, the indoor temperatu
24°C and the outdoor temperature is 0°C.
(a) What is the rate at which energy is transferred by heat through the glass?
W
(b) How much energy is lost through the window in one day, assuming the temperatures inside and outside remain
constant?
Question 11
Which statement about thermal conductivity is FALSE?
O a. The thermal conductivity of timber is greater in the longitudinal compared to the radial direction.
O b. Lower density results in lower thermal conductivity.
C. Thermal modification of wood reduces its thermal conductivity.
Od. Thermal conductivity of air is higher compared to wood.
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- Q2/ How much heat does 50g of aluminum give off as it cools from 100c° to 10c°? for aluminum c=88 J/Kg.c°.arrow_forwardQ1: A. 6 kg of steel, specific heat capacity 500 J\Kg K, is heated from 59°F to 212°F C. How much heat is required?arrow_forwardA line measured with a 50-m long steel tape was determined to be 645.22 meter when the average temperature during taping was 15.750C. If the tape is of standard length at 200C and the coefficient of thermal expansion of steel is 0.0000116/10C, the correct length of the measured line isarrow_forward
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