If a woman weighs 125 lb, her mass expressed in kilograms is x kg, where x is
A) less than 125.
B) greater than 125.
A
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A solid cylinder of radius R = 1.0 m and mass 10 kg rotates about its axis. When its angular velocity is 10 rad/s, its angular momentum (in kg?m2/s) is
A. 50. B. 20. C. 40. D. 25. E. 70.
Identify the correct sequence of life events for a high mass star
A) red supergiant, main sequence, neutron star, supernova B) red supergiant, main sequence, supernova, neutron star C) main sequence, red supergiant, supernova, neutron star D) main sequence, red supergiant, neutron star, supernova
An object has kinetic energy of 324 J. If its speed is 9 m/s, what is its mass?
a. 8 b. 36 c. 1620 d. 324
Ellis and Randy are looking at a molecular absorption spectrum. The spectral lines appear to fall into two groups with a gap in the middle. Ellis says that this must be an absorption spectrum for transitions between the v = 0 and v = 1 vibrational states of a diatomic molecule. Randy says the gap in the middle must occur because a ?J = 0 transition is forbidden. Which one, if either, is correct,
and why? a. Ellis, because rotational levels are separated by greater energy differences than vibrational levels. b. Randy, because rotational levels are separated by greater energy differences than vibrational levels. c. Ellis, because the ?J = 0 transition is the most prominent spectral line in transitions between vibrational levels. d. Neither, because rotational levels are separated by greater energies that vibrational levels and ?J = 0 transitions are not forbidden. e. Both, because vibrational levels are separated by greater energy differences than rotational levels and ?J = 0 transitions are forbidden.