Two very small +3.00-?C charges are at the ends of a meter stick. Find the electric potential (relative to infinity) at the center of the meter stick. (k = 1/4??0 = 8.99 × 109 N ? m2/C2 )
A) 0.00 V
B) 2.70 × 104 V
C) 5.40 × 104 V
D) 1.08 × 105 V
D
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A magnesium alloy that begins with the letters “AK” has major alloy elements of aluminum and _________.
Fill in the blank(s) with the appropriate word(s).
Which of the following explains why the Moon rises in the east and sets in the west?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.
An ice skater has a moment of inertia of 5.0 kg?m2 when her arms are outstretched. At this time she is spinning at 3.0 revolutions per second (rps)
If she pulls in her arms and decreases her moment of inertia to 2.0 kg?m2, how fast will she be spinning? A) 2.0 rps B) 3.3 rps C) 7.5 rps D) 8.4 rps E) 10 rps
Parallel rays of light that hit a concave mirror will come together:
a. at the focal point. b. at a point half way to the focal point. c. at infinity. d. at the center of curvature.