A wheel (radius = 12 cm) is mounted on a frictionless, horizontal axle that is perpendicular to the wheel and passes through the center of mass of the wheel. A light cord wrapped around the wheel supports a 0.40-kg object. If released from rest with the string taut, the object is observed to fall with a downward acceleration of 3.0 m/s2 . What is the moment of inertia (of the wheel) about the
given axle?
a. 0.023 kg/m2
b. 0.013 kg/m2
c. 0.020 kg/m2
d. 0.016 kg/m2
e. 0.035 kg/m2
b
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An ideal fluid in a pipe of diameter 14. cm is moving at 6.0 m/s
(a) If the incompressible fluid density is 1.05 grams/cc, what is the flow rate in kg/s? (b) What is the speed of flow if the pipe narrows to 4.0 cm radius?
The nucleus that has the greatest mass per nucleon is
A) hydrogen. B) iron. C) lead. D) uranium. E) plutonium.
Suppose you are facing north and you see the Big Dipper close to your northern horizon, with Polaris (and the Little Dipper) above it. Where will you see the Big Dipper in six hours?
A) still in the same place, below Polaris B) to the left of Polaris; that is, 90 degrees clockwise from its current position C) directly above Polaris D) to the right of Polaris; that is, 90 degrees counterclockwise from its current position
Tripling the focal length in a telephoto lens, while keeping the aperture size constant, will change the f-number by what factor?
a. 1/9 b. 1/3 c. 3 d. 9 e. 1/6