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Q. An image of the moon is focused onto a screen using a converging lens of focal length f= 34.3 cm. The diameter of the moon is 3.48×10^6 m, and its mean distance from the earth is 3.85×10^8 m. What is the diameter of the moon's image?

Q. If the translation rms speed of the water vapor molecules in air is 703 m/s, what is the translational rms speed of the carbon dioxide molecules in the same air? Both gases are at the same temperature.

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