The number of electrons delivered daily to an average American home by an average power utility in the early 21st century was
A) zero.
B) 110.
C) 220.
D) billions of billions.
E) none of the above
Answer: A
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A 10.0 kg mass is attached to the end of a 2.00 m brass rod with a 1.00 mm diameter. If the tensile modulus of brass is 
then the period of the simple harmonic motion of the mass is
A. 0.175 sec. B. 0.105 sec. C. 0.133 sec. D. 0.145 sec. E. 0.167 sec.
We find that 2N current loops are coplanar and coaxial. The first has radius a and current I. The second has radius 2a and current 2I, and the pattern is repeated up to the Nth, which has radius Na and current NI. The current in the loops alternates in direction from loop to loop as seen from above. Thus the current in the first loop is counterclockwise, in the next clockwise, up to the last loop where it is again clockwise. The magnitude of the magnetic field at the center of the loops is
A.
B.
.C.
.D.
.E.
.A rock is suspended from a scale reads 10.0 N. A beaker of water is raised up so the rock is totally submerged in the water. The scale now reads 6.25 N.What is the density of the rock?
A) 2.00 times the density of water B) 2.33 times the density of water C) 2.67 times the density of water D) 3.00 times the density of water E) 2.50 times the density of water
A temperature change from 15°C to 45°C corresponds to what incremental change in °F?
a. 54 c. 36 b. 40 d. 313