A seismograph
A) predicts earthquakes.
B) measures ground movement.
C) helps prevent earthquakes.
D) measures fault displacement.
Answer: B
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An isolated object is initially spinning at a constant speed. Then, although no external forces act upon it, its rotational speed increases. This must be due to
A. a decrease in the moment of inertia. B. an increase in the mass. C. an increase in the moment of inertia. D. an increase in the angular momentum. E. impossible, angular momentum conservation is violated.
A double-slit experiment uses light of wavelength 633. nm with a slit separation of 0.100 mm and a screen placed 2.0 m away
(a) What is the linear width of the central fringe? (b) What is the lateral distance between 1st and 2nd order fringes? (c) What is the angular separation between the central maximum and the 1st order maximum?
The acceleration of gravity on Earth is approximately 10 m/s2 (more precisely, 9.8 m/s2). If you drop a rock from a tall building, about how fast will it be falling after 3 seconds?
A) 30 m/s B) 10 m/s C) 10 m/s2 D) 30 m/s2 E) 20 m/s
The critical angle in air for a particular type of glass is 39.0°. What is the speed of light in this class glass? (c = 3.00 × 108 m/s)
A) 1.97 × 108 m/s B) 1.94 × 108 m/s C) 1.91 × 108 m/s D) 1.89 × 108 m/s E) 2.00 × 108 m/s