In a series RLC circuit the total impedance
A) equals R + XL + XC.
B) never exceeds R.
C) always exceeds R.
D) never is less than R.
D
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A 20.0 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the frequency of the fundamental mode?
A. 414 Hz B. 387 Hz C. 345 Hz D. 302 Hz E. 295 Hz
In Ptolemy's geocentric model, the normal eastward motion of the planets was along
A) a retrograde loop. B) a deferent. C) the equant. D) an epicycle. E) an ellipse.
Three identical very small 50-kg masses are held at the corners of an equilateral triangle, 0.30 m on each side
If one of the masses is released, what is its initial acceleration if the only forces acting on it are the gravitational forces due to the other two masses? (G = 6.67 × 10-11 N ? m2/kg2) A) 1.9 × 10-8 m/s2 B) 4.2 × 10-8 m/s2 C) 6.4 × 10-8 m/s2 D) 2.5 × 10-8 m/s2 E) 3.7 × 10-8 m/s2
If molecules in the sky scattered red-orange light strongly instead of blue light, sunsets would be
A) orange. B) yellow. C) green. D) blue.