Q 73

For a force to be a conservative force,when applied to a single test body
A)it must have the same value at all points in space.
B)it must have the same direction at all points in space.
C)it must be parallel to a displacement in any direction.
D)equal work must be done in equal displacements.
E)no net work must be done for motion in closed paths.

Q 74

A single conservative force F_{x} = (6.0x 12)N (x is in m)acts on a particle moving along the x axis.The potential energy associated with this force is assigned a value of +20 J at x = 0.What is the potential energy at x = 3.0 m?
A)+11 J
B)+29 J
C)+9.0 J
D)9.0 J
E)+20 J

Q 75

As a particle moves along the x axis it is acted upon by a single conservative force given by F_{x} = (20 4.0x)N where x is in m.The potential energy associated with this force has the value +30 J at the origin (x = 0).What is the value of the potential energy at x = 4.0 m?
A)48 J
B)+78 J
C)18 J
D)+48 J
E)+80 J