A filament running along the x axis from the origin to x = 80.0 cm carries electric charge with uniform density. At the point P with coordinates (x = 80.0 cm, y = 80.0 cm), this filament creates electric potential 100 V. Now we add another filament along the y axis, running from the origin to y = 80.0 cm, carrying the same amount of charge with the same uniform density. At the same point P, the
pair of filaments creates potential:
1.greater than 200 V.
2.200 V.
3.100 V.
4.between 0 and 200 V.
5.0.
2
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Granulation is caused by which energy transport?
a. convection b. radiation c. conduction d. none of the others
The average U.S. citizen receives measurable radiation from man-made sources such as power plants, medical and dental X-rays, and consumer products. The radiation received from natural sources is
A. almost immeasurable. B. more than that received from artificial sources. C. measurable but less than that received from artificial sources. D. about the same as that received from artificial sources.
In ?- decay, the number of neutrons in the nucleus is
A) decreased by 1. B) decreased by 2. C) increased by 1. D) increased by 2. E) remains unchanged.
The heat of fusion for lead at 327.0 
22.9 kJ/kg and the specific heat of lead is 0.130 kJ/kg
What is the energy needed to melt 100 grams of lead starting at 0
?
A. 3.56 kJ B. 4.23 kJ C. 6.54 kJ D. 7.02 kJ E. 7.76 kJ