The amount of heat that flows through a rod whose ends are held at different temperatures is proportional to the area of the rod
Indicate whether the statement is true or false
TRUE
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If a circle has a radius of 1.109 m, what is its area expressed to the correct number of significant figures?
A) 3.86 m2 B) 3.863 m2 C) 3.864 m2 D) 3.8638 m2 E) 3.86379 m2
Water flows over a waterfall that is 20 m high at the rate of 4.0 × 104 kg/s. If this water powers an electric generator with a 40% efficiency, how many watts of electric power can be supplied?
What will be an ideal response?
China can benefit from investments in renewable energy sources
What will be an ideal response?
Potential Energy: In the figure, +4.0-?C and -4.0-?C point charges are located as shown. Now an additional +2.00-µC point charge is placed at point A. What is the electric potential energy of this system of three charges, relative to infinity? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
A. +264 mJ B. -264 mJ C. 0.00 J D. -26.4 mJ E. +26.4 mJ