1. About what percentage of the heat produced by burning gasoline is turned into useful work by a typical automobile?
(a) 20%.
(b) 50%.
(c) 80%.
(d) 90%.
(e) Nearly 100%.
2. Which statement is true regarding the entropy change of an ice cube that melts?
(a) Since melting occurs at the melting point temperature, there is no temperature change so there is no entropy change.
(b) Entropy increases.
(c) Entropy decreases
.