Question

Entropy:

A) for the universe never decreases

B)has its change defined by Q/T for reversible processes

C)is measured of how much energy is not availiable to do work

D)includes all of these

E) none of these

2)If the low temperature reservoir is at 300 K and the Carnot efficency is at 40%, what is T_h?

A)Below 300 K

B)500 K

C)750 K

D)1200 K

E) none of these

3)A sample of gas has an absolute pressure of 2.00 atmospheres, a volume of 3.00 L and is at a temperature of 400 K. If this gas sample temerpature is changed so its pressure is now 5.00atms while its volume is 6.00 L, what is its new tempertature?

a)80K

B)400K

C)600K

D)2000K

E)none

Answer 1

1) none of these in reversible process entropy constant ang the entropy of universeis always constant

2) the answer is C   efficiency= t1-t2/T

                         t1= 300/0.4

                            = 750 k

3)the neq temperature is t2=t1p2v2/p1v1

                                      = 400*5*6/2*3

                                       =2000k