When a thin copper wire that is 178 m long is connected between a 1.2-V potential difference, the current through the wire is 2.0 amps. What is the diameter of this wire? The resistivity of copper is 1.72 × 10-8 ? ? m
What will be an ideal response?
2.5 mm
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When we see that a spectral line of a galaxy is broadened, that is, spanning a range of wavelengths, we conclude that
A) we do not have very good resolution of a star's orbital velocity. B) there are many stars traveling at extremely high orbital velocities. C) there are different Doppler shifts among the individual stars in the galaxy. D) we are actually measuring the orbital velocity of a cloud of atomic gas. E) we are actually measuring the orbital velocity of dark matter.
Which of the following is not considered a potential solution to the question of why we lack any evidence of a galactic civilization?
A) The galactic civilization is deliberately avoiding contact with us. B) There is no galactic civilization because we are the first species ever to achieve the ability to study the universe. C) There is no galactic civilization because all civilizations destroy themselves before they achieve the ability to colonize the galaxy. D) The galactic civilization probably is undetectable because they operate under different laws of physics from the ones we know.
You can increase the temperature of a gas by compressing it
Indicate whether the statement is true or false
The birth of a thunderstorm occurs when
A) warm, humid air rises in a stable environment. B) warm, humid air rises in an unstable environment. C) a cold front encounters a warm front. D) a maritime polar air mass encounters a maritime tropical air mass.