QUESTION 1 If you do 1,000 J of work on a system and remove 500 J of heat from it, what is the change in its internal energy?
a.-1,500 J
b.-500 J
c.1,500 J
d.500 J
QUESTION 2 The first law of thermodynamics is related to the conservation of which quantity?
a.matter
b.heat
c.work
d.energy
QUESTION 3 Which of the following devices does not convert heat energy to mechanical energy?
a.internal combustion engine
b.windmill
c.steam turbine
d.coal-fueled power plant
QUESTION 4 Which of the following statements correctly describes a heat engine?
a.Work is used to transfer thermal energy from a hot reservoir to a cold one.
b.Work is done by transferring thermal energy from a cold reservoir to a hot one. c.Work is used to transfer thermal energy from a cold reservoir to a hot one.
d.Work is done by transferring thermal energy from a hot reservoir to a cold one.
QUESTION 5 How much work can be extracted from 5.00 × 104 J of heat when 2.00 × 104 J of heat is exhausted?
a.7.00 × 104 J
b.3.00 × 104 J
c.3.00 × 104 J
d.7.00 × 104 J
QUESTION 6 Which of the following statements would best describe how to increase the work done by a heat engine?
a.Raise the temperature of the exhaust.
b.Raise the temperature of the cold reservoir.
c.Lower the temperature of the exhaust.
d.Lower the temperature of the hot reservoir.