judge whether the following statements are T (True) or F (False). [1] ( T or F ) Temperature (T) is an intensive variable. [2] ( T or F ) Entropy (S) is an extensive variable. [3] ( T or F ) Stress is an extensive variable. [4] ( T or F ) Electrostatic potential is an extensive variable. [5] ( T or F ) Entropy (S) is a state function. [6] ( T or F ) Electrostatic potential is a state function. [7] ( T or F ) Work (w) is a state function. [8] ( T or F ) Since it does not violate the first law of thermodynamics, one can transfer heat from a cold reservoir to a hot reservoir without doing any work to the system. [9] ( T or F ) The efficiency of a Carnot cycle using ideal gas as the working substance should be higher than that using non-ideal van der Waal gas. [10] ( T or F ) The entropy of constant-temperature and constant-volume system should be at the minimum at a thermodynamic equilibrium