The six diagrams represent the sky at six different latitudes. Which diagram represents the paths of stars at the South Pole?
What will be an ideal response?
Answer: b
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Momentum: A 0.330-kg volleyball is thrown vertically downward with a speed of 0.150 m/s in a place where g = 9.81 m/s2. It takes it 0.0655 s to reach the ground. What is the magnitude of its momentum just before it hits the ground?
A. 0.212 kg ? m/s B. 0.262 kg ? m/s C. 0.163 kg ? m/s D. 0.0216 kg ? m/s E. 0.0418 kg ? m/s
Starting from rest, an electron accelerates through a potential difference of 67 V. What is its de Broglie wavelength? (h = 6.63 × 10^-34 J×s, me = 9.11 × 10^-31 kg, and 1 eV = 1.60 × 10^-19 J)
a. 1.1 × 10^-10 m c. 1.9 × 10^-10 m b. 1.5 × 10^-10 m d. 2.3 × 10^-10 m
In what direction does a comet's tail point?
A. along the comet's orbit in the direction the comet is moving B. toward the Sun, pulled by its gravity C. away from the Sun D. perpendicular to the comet's orbit E. trailing the comet in its orbit
An organ pipe open at both ends is 1.5 m long. A second organ pipe that is closed at one end and open at the other is 0.75 m long. The speed of sound in the room is 330 m/s. Which of the following sets of frequencies consists of frequencies which can be produced by both pipes?
a. 110 Hz, 220 Hz, 330 Hz b. 220 Hz, 440 Hz, 660 Hz c. 110 Hz, 330 Hz, 550 Hz d. 330 Hz, 440 Hz, 550 Hz e. 220 Hz, 660 Hz, 1 100 Hz