Glycerin, with a viscosity of 1.5 N s/m2, is flowing with an average speed of 1.2 m/s through a tube that has a radius of 5.0 mm and is 25 cm long. What is the drop in pressure over the length of this pipe?
A) 140 kPa
B) 46 kPa
C) 72 kPa
D) 76 kPa
E) 130 kPa
Question 2
Given perfect lenses, what is the main reason that a telescope with a large-diameter objective lens can produce a sharper image than one with a small-diameter lens?
A) A larger lens can gather more light than a smaller lens.
B) A larger lens can focus more accurately than a smaller lens.
C) There is less diffraction with a larger lens than with a smaller lens.
D) A larger lens can focus more wavelengths of light than a smaller lens.
E) A larger lens has a longer focal length than a smaller lens.
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