Compared to Jupiter, Saturn's upper atmosphere is notably lacking in the element ________
Fill in the blank(s) with correct word
helium
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Why do we believe the Cambrian explosion occurred so suddenly?
A) oxygen concentrations reached critical levels necessary to support more complex life B) organisms became sufficiently complex that more diversity became possible C) climate change due the end of the last snowball Earth phase D) all of these
A container is filled with a mixture of helium and oxygen gases. A thermometer in the container indicates that the temperature is 22.°C. Which gas molecules have the greater average speed?
A) The oxygen molecules do because they are diatomic. B) The helium molecules do because they are monatomic. C) The oxygen molecules do because they are more massive. D) It is the same for both because the temperatures are the same. E) The helium molecules do because they are less massive.
Stars in globular clusters belong to Population ________.
A. I B. II C. III D. Zero
Suppose that a steel bridge, 1000 m long, was built without any expansion joints and that only one end of the bridge was held fixed
What would the difference in the length of the bridge be between winter and summer, taking a typical winter temperature as 0.00°C, and a typical summer temperature as 40°C? The coefficient of thermal expansion of steel is 10.5 × 10-6 K-1. A) 0.42 m B) 0.11 mm C) 0.11 m D) 0.42 mm E) 0.37 cm