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.
e
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A wire has resistance R. A second wire has twice the length, twice the diameter, and twice the resistivity of the first wire. What is its resistance?
a. 8R b. R c. R/4 d. The resistance is not given.
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = -5.5 N/C, Ey = Ez = 0 . If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the distance from the origin to the particle at t = 2.0 s?
a. 60 m b. 28 m c. 44 m d. 12 m e. 88 m
Describe the process of crystallization.
What will be an ideal response?
A uniform 1.0-N meterstick is suspended horizontally by vertical strings attached at each end. A 2.0-N weight is suspended from the 10-cm position on the stick, another 2.0-N weight is suspended from the 50-cm position, and a 3.0-N weight is suspended from the 60-cm position. What is the tension in the string attached at the 100-cm end of the stick?
a. 1.9 N c. 3.5 N b. 3.0 N d. 4.0 N