When a 2.75-kg fan, having blades 18.5 cm long, is turned off, its angular speed decreases uniformly from 10.0 rad/s to 6.30 rad/s in 5.00 s
(a) What is the magnitude of the angular acceleration of the fan? (b) Through what angle (in degrees) does it turn while it is slowing down during the 5.00 s? (c) If its angular acceleration does not change, how long after it is turned off does it take the fan to stop.
(a) 0.740 rad/s2 (b) 2330° (c) 13.5 s
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Two horizontal curves on a bobsled run are banked at the same angle, but one has twice the radius of the other. The safe speed (no friction needed to stay on the run) for the smaller radius curve is V
Therefore, the safe speed on the larger radius curve is A) 0.71 V. B) 0.10 V. C) 1.4 V. D) 0.5 V. E) 2. V.
Star A is a main sequence star of spectral type F2 and star B is a white dwarf of spectral type B4. Which statement below is correct?
A) Star A appears brighter than star B. B) Star B appears brighter than star A. C) Star A is hotter than star B. D) Star B is hotter than star A. E) None of the above can be said about these two stars.
A spherical hot air balloon of diameter 20. meters just floats (hovers) when the hot air inside has been heated to a density of 1.00 kg/m3
What is the weight of the balloon and cargo (not including the air inside) if the surrounding air has a density of 1.30 kg/m3?
Radioactivity Basics: When a ?- particle is emitted from an unstable nucleus, the atomic number of the nucleus
A. increases by 1. B. decreases by 1. C. increases by 2. D. decreases by 2. E. does not change.