A copper wire is found to break when subjected to minimum tension of 36. N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minimum tension of
A) 36. N
B) 26. N
C) 18 N
D) 9.0 N
E) 51. N
Question 2Although fossils can be made in numerous ways, only a tiny fraction of living organisms leave behind any kind of fossil remnant because
A) most minerals that replace organic material are soluble in water and so dissolve away
B) the vast majority of dead organisms decay long before any mineral replacement can occur
C) the organic material is destroyed by radioactivity
D) they are destroyed by geological processes before mineral replacement can occur
Question 3A combination of 2.0 in series with 4.0 is connected in parallel with 3.0 . What is the equivalent resistance?
What will be an ideal response?
Question 4What fundamental fact underlies the operation of essentially all electric motors?
A) Iron is the only element that is magnetic.
B) A current-carrying conductor placed perpendicular to a magnetic field will experience a force.
C) Opposite electric charges attract and like charges repel.
D) A magnetic North pole carries a positive electric charge, and a magnetic South pole carries a negative electric charge.
E) Alternating current and direct current are both capable of doing work.
Question 5A system undergoes a reversible cycle that traces a triangle in the p-V plane.
In the first leg of the cycle, the gas contracts at a constant pressure of 100 kPa from 30 L to 22 L; in the second leg, the pressure increases to 150 kPa, with the volume staying constant. In the third leg, the pressure and volume change so that the system follows the straight line that closes the triangle. How much heat is supplied to the system in each cycle? A) 200 J
B) 300 J
C) - 300 J
D) 400 J
E) - 400 J
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