Your friend says that any radio wave travels appreciably faster than any sound wave
A) agree with your friend unconditionally
B) agree with your friend for most common cases
C) disagree with your friend
D) find a new friend
Answer: A
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Sunspots are parts of active solar regions dominated by magnetic fields that encompass all layers of the Sun's atmosphere
a. True b. False Indicate whether the statement is true or false
Answer the following statement(s) true (T) or false (F)
1. A railroad car collides with a similar car at rest. The cars lock together. Such a process must convert a significant fraction of the originally moving car’s kinetic energy to thermal energy. 2. If you rub your hands together, they get warmer (try it!). Rubbing therefore heats your hands 3. The heat energy released by a 1-kg bottle of water as its temperature decreases by 1°C could (if we could convert it to gravitational potential energy) lift that bottle hundreds of meters into the air.
Two stars of masses M and 6M are separated by a distance D. Determine the distance (measured from M) to a point at which the net gravitational force on a third mass would be zero.
A. 0.41 D B. 0.33 D C. 0.37 D D. 0.29 D E. 0.14 D
A hologram is produced from the ________ of a reference beam and an object beam.
Fill in the blank(s) with the appropriate word(s).