An object is made up of three masses connected by massless rods of fixed length
Mass A is located at (30.0 cm, 0 cm) and has a mass of 250 grams, mass B is located at (0 cm, 30.0 cm) and has a mass of 350 grams, mass C is located at (-30.0 cm, 0 cm) and has a mass of 450 grams. What is the moment of inertia of this object about an axis perpendicular to the x-y plane and passing through the origin?
A) 0.0945 kg m2
B) 0.315 kg m2
C) 0.185 kg m2
D) 0.0135 kg m2
E) 0.0450 kg m2
A
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Potential of Point-Charges: Point charges +4.00 ?C and +2.00 ?C are placed at the opposite corners of a rectangle as shown in the figure. What is the potential at point A, relative to infinity, due to these charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
A. 0.899 kV B. 8.99 kV C. 89.9 kV D. 899 kV E. 8990 kV
The block shown is pulled across the horizontal surface at a constant speed by the force shown. If M = 5.0 kg, F = 14 N and ? = 35°, what is the coefficient of kinetic friction between the block and the horizontal surface?
A. 0.44 B. 0.33 C. 0.38 D. 0.28 E. 0.17
A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions
What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.00 × 108 m/s) A) 162 N/C B) 212 N/C C) 82.1 N/C D) 150 N/C E) 52.9 N/C
Which of the following is not the name of a major
lithospheric plate? a) African Plate b) North American Plate c) Japanese Plate d) Indian Plate