13 Two students jump into a swimming pool. Student A floats easily, while student B sinks rapidly in
the water. Which statement is true?
a. the specific gravity of student A is equal to that of student B
b. the specific gravity of student A is less than that of student B
c. the specific gravity of student A is equal to that of water
d. the specific gravity of student A is greater than that of student B
e. the specific gravity of student B is equal to that of water

status: correct (1.0)
correct:
b
your answer:
b
feedback:
Correct.
14 The figure below shows a small piston and cylinder connected via a tube to a larger piston and
cylinder.
If the area of the larger piston is five times that of the smaller piston, how does the pressure in each
cylinder compare?
a. the pressure in the smaller cylinder is five times smaller than the pressure in the larger
cylinder
b. the area of each piston is needed to determine the answer
c. the pressure in the smaller cylinder is equal to the pressure in the larger cylinder
d. the force on the smaller piston is needed to determine the answer
e. the pressure in the smaller cylinder is five times larger than the pressure in the larger
cylinder
status: correct (1.0)
correct:
c
your answer:
c
feedback:
Correct.
15 When air blows past a chimney the speed of the air increases as it goes over the top of the chimney.
What effect does this have on the air pressure just above the chimney?
a. the air pressure above the chimney is unaffected
b. the air pressure above the chimney is increased
c. the air pressure above the chimney is decreased
d. the speed of the air is needed to determine its effect on the air pressure
e. the air pressure above the chimney will either increase or decrease, depending on the size of
the chimney

status: correct (1.0)
correct:
c
your answer:
c
feedback:
Correct.

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- Spring '12
- brown
- Physics, Thermodynamics, Fundamental physics concepts