The gravitational potential energy of a system
1.depends on the reference configuration for zero potential energy.
2.is always positive.
3.is always negative.
4.is none of these.
1
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What is the meaning of a "closed" universe?
A) The universe will expand forever. B) The universe will someday stop expanding and start to collapse. C) The universe will stop expanding in an infinite amount of time. D) The universe is in a steady-state. E) The universe will disappear into a white hole in time.
A beam of monochromatic light passes through a slit that is 11.0 ?m wide. If the first order dark fringe of the resulting diffraction pattern is at an angle of 4.31° away from the centerline, what is the wavelength of light?
A) 602 nm B) 201 nm C) 301 nm D) 402 nm E) 827 nm
The equation of continuity is a statement of which conservation rule applied to fluids in steady laminar flow?
A) conservation of area B) conservation of volume C) conservation of energy D) conservation of momentum E) conservation of mass
A mass spectrometer splits a beam of 
and
singly charged ions having the same velocity by passing the beam through a uniform magnetic field. If the radius of the path for the
ions is 12.0 cm, what will be the radius for the
ions?
A. 9.90 cm B. 10.9 cm C. 12.0 cm D. 13.2 cm E. 14.5 cm