A half-ring (semicircle) of uniformly distributed charge Q has radius R. What is the electric potential at its center?
What will be an ideal response?
Q/4? ?0R
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Addition by 1. Components: Vector 
has a magnitude of 4.0 m and points 30° south of east. Vector 
has a magnitude of 2.0 m and points 30° north of west. The resultant vector 
+ 
is given by
A. 10.0 m at an angle 30° south of east. B. 10.0 m at an angle 60° east of south. C. 2.0 m at an angle 60° south of east. D. 2.0 m at an angle 30° south of east. E. 1.0 m at an angle 30° east of south.
According to Galileo, inertia is a
A) force like any other force. B) special kind of force. C) property of all matter. D) concept opposite to force.
When Lillian hangs from a pair of gym rings, the upward support forces by the rings will always
A) each be half her weight. B) each be equal to her weight. C) add up to equal her weight. D) add up to more than her weight.
In the Southern Hemisphere, the direction of Ekman transport is
A) at a 45° angle from the wind direction. B) parallel to the wind direction. C) to the right of the wind direction. D) to the left of the wind direction.