Which of the following does not affect the period of a pendulum? O A. the length of the string
O B. the mass of the pendulum bob
C. the free-fall acceleration at the pendulum's location
D. All of the above affect the period.

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Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.