4. A copper bar lies between two heat sources given by T₁ = 100°C and Tc = 20°C. The area of the copper bar is 4.5 cm 2 and its thickness is 15 cm. Calculate the ratio of heat transfer by conduction between both sources. a. 96 J/s b. 9624 J/s c. 962 kJ/s d. 962 J/s
4. A copper bar lies between two heat sources given by T₁ = 100°C and Tc = 20°C. The area of the copper bar is 4.5 cm 2 and its thickness is 15 cm. Calculate the ratio of heat transfer by conduction between both sources. a. 96 J/s b. 9624 J/s c. 962 kJ/s d. 962 J/s
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Transcribed Image Text:4. A copper bar lies between two heat sources given by T₁ = 100°C and Tc = 20°C.
The area of the copper bar is 4.5 cm 2 and its thickness is 15 cm. Calculate the
ratio of heat transfer by conduction between both sources.
a. 96 J/s
b. 9624 J/s
c. 962 kJ/s
d. 962 J/s
5. Calculate the ratio of heat flow through a window of 4.0 m² and a thickness of
3.5 mm when the indoor and outdoor temperatures are 25°C and 24°C.
a. 2143 J/s
b. 1143 J/s
c. 11.4 J/s
d. 1200 J/s
6. Six (6) molecules in a container have the following velocities: 400, 550, 345, 678,
899, 200 m/s. Find the average velocity of the gas molecules.
7. The mass of a molecule of an ideal gas is 3.56 x 10-26 kg. Calculate the speed Vrms
at a temperature of 100°C.
8. The temperature of 3.00 mol of an ideal monatomic gas is increased from 30°C to
95°C. The gas is kept at constant volume. Determine the energy transferred as
heat.
9. The temperature of 2.00 mol of an ideal monatomic gas is increased by 25 K at
constant pressure. Determine the work done by the gas.
10. In an adiabatic expansion the pressure of a gas is 150 kPa. This gas expands
from 1.5 L to 3.0 L. For a y = 1.4, determine the final gas pressure.
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