A railroad train travels forward along a straight track at 80.0 m/s for 1000 m and then travels at 40.0 m/s for the next 1000 m. What is the average velocity?
a. 60.0 m/s
c. 63.7 m/s
b. 37.5 m/s
d. 53.3 m/s
D
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Which of the following statements is not true about the sky at Earth's equator?
A) The Sun will pass directly overhead around noon each day. B) Over the course of the year, all 88 constellations will at some point be visible in the evening sky. C) There are no circumpolar stars in the equatorial sky. D) The north celestial pole is directly on your horizon, due north (with Polaris quite nearby).
The buoyant force that keeps a ship afloat is an example of
a. Archimedes' principle. b. Pascal's principle. c. Bernoulli's principle. d. Torricelli's principle. e. none of these principles.
Which of the following signals from an advanced civilization would be easiest to detect?
A) high intensity, narrow bandwidth B) low intensity, wide bandwidth C) high intensity, wide bandwidth D) low intensity, narrow bandwidth
Which of the following is the correct equation for the momentum of a photon?
A) p = (hc)/? B) p = ?/c C) p = (hc)/f D) p = (hf)/c E) p = (h?)/c