Charge of a uniform density (8.0 nC/m2) is distributed over the entire xy plane. A charge of uniform density (5.0 nC/m2) is distributed over the parallel plane defined by z = 2.0 m. Determine the magnitude of the electric field for any point with z = 1.0 m
a. 0.45 kN/C
b. 0.17 kN/C
c. 0.28 kN/C
d. 0.73 kN/C
e. 0.62 kN/C
b
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Which of the following is not a piece of evidence supporting the idea that Europa may have a subsurface ocean?
A) Astronomers have detected small lakes of liquid water on Europa's surface. B) Europa has a magnetic field that appears to be induced by Jupiter's magnetic field. C) Photos of Europa's surface show regions that appear to consist of jumbled icebergs frozen in place. D) Europa's surface shows few impact craters.
A metal sphere of radius 10 cm carries a charge of +2.0 ?C uniformly distributed over its surface. What is the magnitude of the electric field due to this sphere at a point 5.0 cm outside the sphere's surface? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 4.0 × 105 N/C B) 8.0 × 105 N/C C) 4.2 × 106 N/C D) 4.0 × 107 N/C E) 8.0 × 107 N/C
A person is dragging a packing crate of mass 100 kg across a rough horizontal floor where the coefficient of kinetic friction is 0.400. He exerts a force F sufficient to accelerate the crate forward
At what angle above horizontal should his pulling force be directed in order to achieve the maximum acceleration? A) 21.8° B) 27.7° C) 30° D) 34.5° E) 45°
A small but dense 2.0-kg stone is attached to one end of a very light rod that is 1.2 m long. The other end of the rod is attached to a frictionless pivot. The rod is raised until it is vertical, with the stone above the pivot
The rod is released and the stone moves in a vertical circle with no air resistance. What is the force that the rod exerts on the stone as the stone moves through the bottom of the circle? A) 20 N B) 40 N C) 60 N D) 80 N E) 100 N