What is the magnitude of the magnetic field at point P if a = R and b = 2R?
A.
B.
C.
D.
E.
Answer: B
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Two instruments produce a beat frequency of 5 Hz. If one has a frequency of 264 Hz, what could be the frequency of the other instrument?
A. 269 Hz B. 254 Hz C. 264 Hz D. 5 Hz E. 274 Hz
Two strings of identical material and radius are stretched with the same tension with their ends fixed, but one string is 8.0 mm longer than the other. Waves on these strings propagate at 420 m/s
The fundamental frequency of the longer string is 528 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency? A) 22 Hz B) 11 Hz C) 16 Hz D) 5.5 Hz E) 27 Hz
The first stage of Earth's evolution is _____
A) cratering B) basin formation C) differentiation D) slow surface evolution
What is the difference between a synodic month and a sidereal month?
A) A synodic month is the time it takes for a cycle of lunar phases, and a sidereal month is the time it takes the Moon to orbit Earth (relative to the stars). B) A synodic month is our 30- or 31-day calendar month and a sidereal month is the time it takes for a cycle of the Moon's phases. C) A synodic month is the time it takes for a cycle of the Moon's phases and a sidereal month is our 30- or 31-day calendar month. D) A synodic month is based on the orbit of some planet around the Sun and a sidereal month is based on the orbit of the Moon around the Earth.