The energy of sound in air eventually becomes
A) increased internal energy in the air.
B) weaker and weaker until it disappears.
C) cancelled by destructive interference.
D) all of the above
E) none of the above
Answer: A
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Why do the constellations that are visible in the sky at night change with the seasons?
A. because the celestial sphere revolves around Earth B. because Earth revolves around the Sun C. because Earth rotates about an axis D. because Earth is a sphere
Two radio antennas are 10 km apart on a north-south axis on high mountain tops at the seacoast. The antennas broadcast identical AM radio signals,
in phase, at a frequency of 4.70 MHz. A steamship, 200 km offshore, travels toward the north at 15 km/h and passes east of the antennas. A radio on board the ship is tuned to the broadcast frequency. The reception of the radio signal on the ship is a maximum at a given instant. How much later until the next occurrence of maximum reception? (c = 3.00 × 108 m/s) A) 5.1 min B) 3.8 min C) 6.4 min D) 7.7 min E) 8.9 min
If you stand in front of a convex mirror, at the same distance from it as its focal length,
A) you won't see your image because there is none. B) you won't see your image because it is focused at infinity. C) you will see your image and you will appear smaller than you. D) you will see your image and you will appear larger than you. E) you will see your image and it will be the same size as you except upside down.
Answer the following statement(s) true (T) or false (F)
If a complex number is equal to its own complex conjugate, then the complex number is real