A spherical, non-conducting shell of inner radius r1 = 10 cm and outer radius r2 = 15 cm carries a total charge Q = 15 ?C distributed uniformly throughout the volume of the shell
What is the magnitude of the electric field at a distance r = 12 cm from the center of the shell? (k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 5.75 × 103 N/C
B) zero
C) 2.87 × 106 N/C
D) 5.75 × 106 N/C
E) 2.87 × 103 N/C
C
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When a nucleus undergoes beta-minus decay, it changes into
A) another isotope of itself. B) a higher mass number. C) a higher atomic number. D) a higher neutron number. E) a lower proton number.
A Carnot engine runs between a hot reservoir at Th and a cold reservoir at Tc. If one of the temperatures is either increased or decreased by 3.5 K, which of the following changes would increase the efficiency by the greatest amount?
a. increasing Th b. increasing Tc c. decreasing Tc d. cannot be determined from information given
Consider two steel rods, A and B. B has three times the area and twice the length of A, so Young's modulus for B will be what factor times Young's modulus for A?
a. 3.0 c. 1.5 b. 0.5 d. 1.0
A ray of light enters a pane of glass with an angle of incidence of 
The index of refraction of the glass is 1.48. What is the angle of refraction as the ray emerges from the other side of the pane?
A. 
B. 
C. 
D. 
E. 