Nuclear Fission and Fusion: If a 2.0-MeV neutron released in a fission reaction loses half its kinetic energy in each moderator collision, how many collisions are needed to reduce its kinetic energy to 1/25 eV?
A. 6
B. 18
C. 26
D. 30
E. 4
Answer: C
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A 0.30-kg rock is swung in a circular path and in a vertical plane on a 0.25-m-length string. At the top of the path, the angular speed is 12.0 rad/s. What is the tension in the string at that point?
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a. constant b. increasing c. decreasing d. none of these