16. A rod of 1-m proper length moves relative to an observer with velocity v = 3/5 c, where c is the speed of light. What is the length of the rod measured by the observer? (A) 0.6 m (B) 0.64 m (C) 0.8 m (D) 1 m (E) 1.25 m

8. Which one of the following statements of the second law of thermodynamics is wrong? (A) It is impossible for a heat engine that operates in a cycle to convert its work input completely into heat. (B) It is impossible for a cyclical device to transfer heat continuously from a cold body to a hot body without the input of work or other effect on the environment. (C) No cyclical heat engine has a greater efficiency than a reversible engine operating between the same two temperatures. (D) In a reversible process the entropy of an isolated system stays constant; in an irreversible process the entropy increases. (E) None of the above is wrong.

16. A rod of 1-m proper length moves relative to an observer with velocity v = 3/5 c, where c is the speed of light. What is the length of the rod measured by the observer?
(A) 0.6 m
(B) 0.64 m
(C) 0.8 m
(D) 1 m
(E) 1.25 m

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