An observer's nadir is
a. the point directly opposite the observer's zenith.
b. the north point on the observer's horizon.
c. located at the center of Earth.
d. always located near a circumpolar constellation.
e. directly opposite the north celestial pole.
A
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In which of the following cases is the displacement's magnitude half the distance traveled?
a. 10 steps east followed by 3 steps west c. 5 steps east followed by 10 steps west b. 22 steps east followed by 11 steps west d. 15 steps east followed by 5 steps west
In general, precession results when
A) torque acts on a body with zero angular momentum. B) the direction of torque acting on an object is parallel to the direction of angular momentum of the body. C) there is no torque acting on a body. D) the direction of torque acting on an object has a component perpendicular to the direction of angular momentum of the body. E) the direction of torque acting on an object is opposite to the direction of angular momentum of the body.
A constant force of 15 N in the negative y direction acts on a particle as it moves from the origin to the point 
m. How much work is done by the given force during this displacement?
A. +45 J B. ?45 J C. +30 J D. ?30 J E. +75 J