Question

11) A fluid in an insulated, flexible bottle is heated by ahighresistance wire and expands. If 9 kJ of heat is
applied to the system and it does 5 kJ of work, how much doestheinternal energy change?
A) 14 kJ
B) 45 kJ
C) 4 kJ
D) -4 kJ

12) The temperature is increased from 20°C to 180°C. Bywhat factordoes the rms speed of a molecule change?
A) 1.2
B) 1.5
C) 3.0
D) 2.4

13) What is the maximum efficiency of an engine operating betweenareservoir in which ice and water coexist,
and a reservoir in which water and steam coexist? The pressureisconstant at 1.0 atmosphere for both
reservoirs.
A) 0.27%
B) 1.0%
C) 27%
D) 100%

6) A child does 350 J of work while pulling a box from the groundupto his tree house with a rope. The tree
house is 8.4 m above the ground. What is the mass of the box?
A) 2.6 kg
B) 3.2 kg
C) 4.3 kg
D) 3.9 kg
7) 4.00 × 105 J of work are done on a 1110 kg car whileitaccelerates from 10.0 m/s to some final velocity. Find
this final velocity.
A) 25.7 m/s
B) 22.9 m/s
C) 28.6 m/s
D) 31.5 m/s
8) A block starts from rest at the top of a 31.0° inclinedplane andencounters a spring, of constant 3.4 kN/m,
rigidly attached to the plane. If the block's mass is 33.0 kg anditcompresses the spring by 37.0 cm, find the
distance the block travelled before it encountered thespring.
A) 82.6 cm
B) 74 m
C) 137 cm
D) 1.0 m