Resistors in Combination: What is the equivalent resistance of the circuit shown in the figure? The battery is ideal and all resistances are accurate to 3 significant figures.
A. 950 ?
B. 450 ?
C. 392 ?
D. 257 ?
Answer: C
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Two charges are located on the x-axis. A 22 ?C charge is located at the origin and a 47 ?C charge is located at x = 4.0 m. What is the magnitude of the electric field at x = 7.5 m?
a. 
b. 
c. 
d. 
e. 
Planet A has an orbit with a semi-major axis of 3 Astronomical Units. Planet B hasan orbit with a semi-major axis of 12 Astronomical Units. How does the orbital periodcompare between the two planets? Use P squared = a cubed to estimate.
a) Planet B has an orbital period 64 times longer than Planet A. b) Planet B has an orbital period 4 times shorter than Planet A. c) Planet B has an orbital period 4 times longer than Planet A. d) Planet B has an orbital period 8 times longer than Planet A. e) Planet B has an orbital period 64 times shorter than Planet A.
A mirror lies flat on a table. A beam of light strikes the mirror with an angle of incidence or 15°, the reflected ray being to the right of the incident beam. The right edge of the mirror is then lifted so that the mirror now makes a 5° angle with the horizontal. What is the resulting angle between the incident beam and the reflected beam?
a. 25° c. 35° b. 20° d. The angle is not given.