An 8 000-kg aluminum flagpole 100-m high is heated by the sun from a temperature of 10C to 20C. Find the increase in internal energy (in J) of the aluminum. (The coefficient of linear expansion is 24 106 (C)1, the density is 2.7 103 kg/m3, and the specific heat of aluminum is 0.215 cal/g/C.)
a. 7.2 105
b. 7.2 107
c. 7.2 103
d. 7.2 101
e. 7.2 102
[Ques. 2] An 8 000-kg aluminum flagpole 100-m long is heated by the sun from a temperature of 10C to 20C. Find the heat transferred (in J) to the aluminum if the specific heat of aluminum is 0.215 cal/g/C.
a. 7.2 105
b. 7.2 107
c. 7.2 103
d. 7.2 101
e. 7.2 102
[Ques. 3] An 8 000-kg aluminum flagpole 100-m long is heated by the sun from a temperature of 10C to 20C. Find the work done (in J) by the aluminum if the linear expansion coefficient is 24 106 (C)1 . (The density of aluminum is 2.7 103 kg/m3 and 1 atm = 1.0 105 N/m2.)
a. 287
b. 425
c. 213
d. 710
e. 626
[Ques. 4] Five moles of an ideal gas expands isothermally at 100C to five times its initial volume. Find the heat flow into the system.
a. 2.5 104 J
b. 1.1 104 J
c. 6.7 103 J
d. 2.9 103 J
e. 7.0 102 J
[Ques. 5] One gram of water is heated from 0C to 100C at a constant pressure of 1 atm. Determine the approximate change in internal energy (in cal) of the water.
a. 160
b. 130
c. 100
d. 180
e. 50
[Ques. 6] Determine the work done by 5 moles of an ideal gas that is kept at 100C in an expansion from 1 liter to 5 liters.
a. 2.5 104 J
b. 1.1 104 J
c. 6.7 103 J
d. 2.9 103 J
e. 8.4 103 J
[Ques. 7] In an isovolumetric process
a. the temperature remains constant.
b. no heat is transferred between a system and its surroundings.
c. the pressure remains constant.
d. the volume remains constant.
e. the internal energy is constant.
[Ques. 8] In an isobaric process
a. the volume remains constant.
b. the temperature remains constant.
c. the pressure remains constant.
d. no heat is transferred between a system and its surroundings.
e. the internal energy is constant.
[Ques. 9] In an isothermal process
a. the volume remains constant.
b. the temperature remains constant.
c. no heat is transferred between a system and its surroundings.
d. the pressure remains constant.
e. the internal energy is not constant.
[Ques. 10] In an adiabatic free expansion
a. no heat is transferred between a system and its surroundings.
b. the pressure remains constant.
c. the temperature remains constant.
d. the volume remains constant.
e. the process is reversible.
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