An iron nail is attracted
A) more strongly to the north pole of a magnet.
B) more strongly to the south pole of a magnet.
C) equally to either pole of a magnet.
D) none of the above
Answer: C
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: In an effort to increase the miles per gallon in automobiles many steel parts are being replaced with polymer parts where the strength of steel is not required.
The blades of the fan that cool the radiator experience a centripetal stress of less than 1×105 Pa when the fan blade material density is reduced to approximately 1×103 kg/m3. Vibration of the fan blades is the greatest problem, and vibration amplitude is minimized by maximizing the elastic modulus (stiffness) of the blade material. In addition it is determined that the Izod impact strength must be a minimum of 100 for sufficient resistance to fracture and fatigue. To control cost it is necessary to select a commodity polymer. Polymers with glass or other material reinforcement are too expensive for this design. What material discussed in this chapter would best suit the design requirements?
Two point charges of +1.0 ?C and -2.0 ?C are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) -36 mJ B) +18 mJ C) 0 mJ D) +36 mJ E) -18 mJ
Radiation of intensity 
is incident on an area perpendicular to the incoming light. The area is now rotated 20 
about an axis perpendicular to the incoming light. What is the resulting power per unit area now reaching the surface?
A. 
B. 
C. 
D. 
E. 
_____ is the field of study focused on searches for life and possible habitats for such life on other worlds
A) Anthropology B) Sociology C) Ecology D) Astrobiology