A solid object is made of two materials, one material having density of 2 500 kg/m3 and the other having density of 6 000 kg/m3 . If the object contains equal volumes of the materials, what is its average density?
a. 3 529 kg/m3
b. 4 250 kg/m3
c. 5 250 kg/m3
d. 8 500 kg/m3
e. more information is needed
b
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If the wavelength of light in vacuum is 469 nm, what is the wavelength of light in a thin film of index of refraction 1.42?
A) 110 nm B) 220 nm C) 330 nm D) 440 nm E) 550 nm
An object is placed 60 cm from a convex lens of focal length 10 cm. What is the magnification?
A) -0.10 B) 0.10 C) 0.15 D) 0.20 E) -0.20
Two wires, each having a weight per unit length of 1.0 × 10?4 N/m, are strung parallel, one 0.10 m above the other. If the wires carry the same current, though in opposite directions, how great must the current in each wire be for the magnetic field of the lower conductor to balance the weight of the upper conductor?
What will be an ideal response?
What is the direction of the electric field vector 
at point P in the situation shown below? (Assume that the balls are actually point particles equidistant from P.)
A. A
B. B
C. C
D. D
E. zero
F. Other
G. AA
H. BB
I. CC
J. DD