Air is considered unstable when it
A) continues to rise because it is warmer than surrounding air.
B) behaves unpredictably.
C) warms as it descends.
D) cools as it rises.
Answer: A
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A spring-powered dart gun is un-stretched and has a spring constant 12.0 N/m. The spring is compressed by 8.00 cm and a 5.00 gram projectile is placed in the gun. The velocity of the projectile when it is shot from the gun is
A. 1.52 m/s. B. 2.54 m/s. C. 3.92 m/s. D. 4.24 m/s. E. 5.02 m/s.
At absolute zero
A. all molecular motion is ceasing B. the pressure of an ideal gas is zero C. the volume of an ideal gas is zero D. the Celsius temperature is zero
The overall energy efficiency of a typical automobile is closest to
A) 60%. B) 2%. C) 10%. D) 40%. E) 90%.
A galactic bar forms from a gravitational disturbance and is a temporary feature of galaxies.
Answer the following statement true (T) or false (F)