A pencil that is 15.7 cm long is released from a vertical position with the eraser end resting on a table. The eraser does not slip as it tips over. Treat the pencil like a uniform rod.
What is the angular speed of the pencil just before it hits the table? A) 13.7 rad/s
B) 7.23 rad/s
C) 3.70 rad/s
D) 24.5 rad/s
E) 16.8 rad/s
Question 2
One of the first atomic bombs released energy equivalent to that of 20,000 tons of TNT explosive.
How much mass was converted to energy by this explosion, given that 1000 tons of TNT produce 4.3 1012 J of energy. Incidentally, modern H-bombs have energy yields 1000 times as much (c = 3.0 108 m/s)
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