An organ pipe open at both ends has a length of 0.80 m. If the velocity of sound in air is what is the frequency of the second harmonic of this pipe?
A) 638 Hz B) 425 Hz C) 213 Hz D) 850 Hz
B
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The particle that orbits the central core inside an atom is
a. the electron. b. the proton. c. the neutron. d. the nucleus. e. none of the above.
A 50-g ball moving at 10 m/s in the +x direction suddenly collides head-on with a stationary ball of mass 100 g. If the collision is perfectly elastic, what is the velocity of each ball immediately after the collision?
A) -3.3 m/s, +6.7 m/s B) +6.7 m/s, -3.3 m/s C) -6.7 m/s, +3.3 m/s D) +3.3 m/s, -6.7 m/s
Which of the following combinations of circuit components can be used to make a tuner for a radio, to select the desired frequency?
a. fixed inductor, variable resistor b. fixed resistor, variable inductor c. fixed inductor, variable capacitor d. fixed capacitor, variable resistor
Legend says that Archimedes, in determining whether or not the king's crown was made of pure gold, measured its volume by the water displacement method. If the density of gold is 19.3 g/cm3, and the crown's mass is 600 g, what volume would be necessary to prove that it is pure gold?
a. 3.1E+1 cm3 b. 3.2E–2 cm3 c. 3.2E+1 cm3 d. 3.0E+1 cm3 e. 1.2E+4 cm3