At position A within a tube containing fluid that is moving with steady laminar flow, the speed of the fluid is 12.0 m/s and the tube has a diameter 12.00 cm.
At position B, the speed of the fluid is 18.0 m/s and the tube has a diameter 6.00 cm. What is the ratio of the density of the fluid at position A to the density of the fluid at position B?
A)
3.00
B)
0.167
C)
0.375
D)
0.333
E)
0.750
Question 2
A camera lens has a focal length of 50.0 mm and an aperture setting of f/4.00. What is the aperture diameter of this lens?
A) 14.2 mm B) 13.6 mm C) 10.1 mm D) 12.5 mm E) 15.0 mm
A U-tube apparatus like the one used by Bernard Davis.
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