What is the average translational kinetic energy of a nitrogen molecule in the air in a room in which the air temperature is 17°C? The Boltzmann constant is 1.38 × 10-23 J/K
A) 6.01 × 10-21 J
B) 4.00 × 10-21 J
C) 5.00 × 10-21 J
D) 7.00 × 10-21 J
E) 9.00 × 10-21 J
A
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A space station out beyond the solar system is rotating with constant angular velocity. A spaceship heading into the station along a diameter of the station, uses its rockets to brake, and then docks inside the station at its center. When the spaceship docks, the angular momentum of the system consisting of the station and ship
A. is less than the original angular momentum of the station. B. is the same as the original angular momentum of the station. C. is greater than the original angular momentum of the station. D. is less than the original angular momentum of the station, but the angular velocity increases. E. is greater than the original angular momentum of the station, but the angular velocity decreases.
What part of a comet has only been seen by a space probe?
A) meteoroid trail B) dust tail C) ion tail D) coma E) nucleus
The mass of an atom of carbon-12 (Z = 6) is less than the mass of 6 protons and 6 neutrons because of binding energy
a. True b. False Indicate whether the statement is true or false
X-rays from the Sun's corona
A) are absorbed in Earth's troposphere. B) are absorbed in Earth's thermosphere. C) cause meteor showers. D) break apart ozone in the stratosphere. E) generally reach Earth's surface and fry us.