Spherical Mirrors: If a spherical concave mirror has a radius of curvature R, its focal length is
A. R/4.
B. R/2.
C. R.
D. 2R.
E. 4R.
Answer: B
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The electric field between two charged conducting plates is
A. Zero B. Strongest near the negative plate C. Strongest near the positive plate D. Uniform
A particle with charge Q is on the y axis a distance a from the origin and a particle with charge q is on the x axis a distance d from the origin. The value of d for which the x component of the force on the second particle is the greatest is:
A) 0 B) a C) sqrt(2a) D) a/2 E) a/sqrt(2)
The fact that the lunar phases repeat on the same solar dates about every 19 years (the Metonic cycle) can be used to __________.
a. predict the future orientation of the Earth's axis in space b. keep lunar calendars approximately synchronized with solar calendars c. predict the dates of future eclipses d. keep the dates of solstices and equinoxes about the same from year to year
Most pulsars have a measured mass of:
A) about 1.4 solar masses. B) less than 1.0 solar masses. C) between 2 and 4 solar masses. D) 5.2 solar masses. E) greater than 10 solar masses.