Why does the Earth's atmosphere contain much more nitrogen than hydrogen?
What will be an ideal response?
Heavier nitrogen can be retained by our gravity, whereas lighter hydrogen leaks away into space, because its average molecular speed at the Earth's temperature exceeds the Earth's escape velocity.
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Light traveling at an angle into a denser medium is refracted
A) toward the normal. B) away from the normal. C) perpendicular to the normal. D) parallel to the normal. E) equally.
A car is 200 m from a stop sign and traveling toward the sign at 40.0 m/s
At this time, the driver suddenly realizes that she must stop the car. If it takes 0.200 s for the driver to apply the brakes, what must be the magnitude of the constant acceleration of the car after the brakes are applied so that the car will come to rest at the stop sign? A) 2.89 m/s2 B) 3.89 m/s2 C) 4.17 m/s2 D) 3.42 m/s2 E) 2.08 m/s2
The fact that the sky is dark at night shows that the observable universe cannot extend forever
Indicate whether the statement is true or false
A trombone or a trumpet can be considered a(n)
A) open organ pipe. B) closed organ pipe.