The pressure in car tires is often measured in pounds per square inch (lb/in.2), with the recommended pressure being in the rang
1 answer:
Answer:
1.36 atm
Explanation:
First, we have to transform lb and in² into the International System of Units.
- The international unit for force is the Newton. The equivalence (based on Earth's gravity) is 1 lb = 4.448 N.
- The international unit for area is the m². The equivalence is 1 m² = 1550 in².
- The resulting unit is known as Pascal. 1 Pa = 1 N/m².
The equivalence between Pascal and atm is 101,325 Pa = 1 atm. Then,
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Answer:
a)
b) entropy of the sistem equal to a), entropy of the universe grater than a).
Explanation:
a) The change of entropy for a reversible process:
The energy balance:
If the process is isothermical the U doesn't change:
The work:
If it is an ideal gas:
Solving:
Replacing:
Given that it's a compression: V2<V1 and ln(V2/V1)<0. So:
b) The entropy change of the sistem will be equal to the calculated in a), but the change of entropy of the universe will be 0 in a) (reversible process) and in b) has to be positive given that it is an irreversible process.