A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the column instead contained the same mass of water, its height would be about
A) 3/4 meter.
B) 10.3 meters.
C) 5.6 kilometers.
D) none of the above
Answer: B
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Whenever the net force on an object is zero, its acceleration
A) may be zero. B) is zero. C) and velocity are the same. D) none of the above
The__________is a theory that proposed to account for spiral arms as compressions of the interstellar medium in the disk of the galaxy
A) spiral relativity theory B) spiral density wave theory C) spiral tracer theory D) spiral arm theory
An object 4 cm high is placed 15 cm in front of a convex mirror with a focal length of -10 cm. What is the image position (in cm)?
a. -8 b. -4 c. -2 d. -6 e. 30
An electron is confined in a harmonic oscillator potential well. A photon is emitted when the electron undergoes a 3?1 quantum jump
What is the wavelength of the emission if the net force on the electron behaves as though it has a spring constant of 9.6 N/m? (mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 290 nm B) 150 nm C) 190 nm D) 580 nm