A wave generated in a medium is a longitudinal wave when
a. there is a net transport of matter by the wave. b. the molecules of the medium are unable to exert forces on each other.
c. molecular displacements are parallel to the wave velocity.
d. molecular displacements are perpendicular to the wave velocity.
e. the density of the medium is less than the density of water.
C
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__________ refers to turning motion around a body's axis whereas ___________ refers to motion of a body around a point
Fill in the blank(s) with correct word
An object of mass 20 kg is raised vertically through a distance of 8.0 m above ground level. Using g = 10 m/s2 what is the potential energy of this object at this position?
A) 1.6 J B) 16 J C) 160 J D) 1600 J E) 16000 J
Which of the following quantities has the same dimensions as kinetic energy, 
?
Note: [[a]] = [[g]] = LT?2; [[h]] = L and [[v]] = LT?1.
A. ma B. mvx C. mvt D. mgh E. mgt
The universe as a whole is
A) curved. B) flat. C) the shape of a saddle. D) has yet to be determined, although most astrophysical data points to a flat universe.