Four identical particles (mass of each = 0.24 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the rotational inertia of this rigid body about an axis that passes through the center of mass of the body and is parallel to the shorter sides of the rectangle?
a. 2.4 kg/m2
b. 2.2 kg/m2
c. 1.9 kg/m2
d. 2.7 kg/m2
e. 8.6 kg/m2
b
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A nitrogen molecule has a diameter of about 0.29 nm. The mean free path of a nitrogen molecule in a tank of dry nitrogen at room temperature and standard pressure is about 0.10 ?m. A tank containing nitrogen at standard temperature and pressure has volume V. If the tank is compressed by means of a piston to 20% of its original volume, what is the mean free path for a nitrogen molecule under the new conditions?
A. 0.089 ?m B. 0.125 ?m C. 0.080 ?m D. 0.112 ?m
The choices below each describe the appearance of an H-R diagram for a different star cluster. Which cluster is most likely to be located in the halo of our galaxy?
A) The diagram shows main-sequence stars of every spectral type except O, along with a few giants and supergiants. B) The diagram shows main-sequence stars of spectral types G, K, and M, along with numerous giants and white dwarfs. C) The diagram shows main-sequence stars of all the spectral types except O and B, along with a few giants and supergiants. D) The diagram shows no main-sequence stars at all, but it has numerous supergiants and white dwarfs.
Scientific models are used to
A) present the scale of the solar system to the general public. B) make specific predictions that can be tested through observations or experiments. C) make miniature representations of the universe. D) prove that past paradigms no longer hold true.
Which of the following is not an exchange particle (that mediates the four fundamental forces of nature)?
A) gravitons B) photons C) leptons D) weak bosons E) gluons