I need help to solve the ones at the bottom not the ones that already say correc

Question

I need help to solve the ones at the bottom not the ones that already say correct. please somebody show me how to solve the final 2 questions at the bottom

What is the efficiency (in %) of an ideal heat engine operating between 36'C and 144°C? 25.8899676375405 % You are correct. PreviousTries Your receipt no. is 1 60-1 429 (D) If the ideal heat engine in the problem above does 7000 J of work, how much heat energy (in J) was absorbed from the hot reservoir? 27037.5J You are correct. Your receipt no. is 160-7253 (f) Previous Tries For the ideal heat engine in the problem above, how much heat energy (in J) was discharged to the cold reservoir? Submit Answer Incorrect. Tries 1/8 Previous Tries An ideal heat engine operating at 15 % efficiency exhausts heat into a cold reservoir at 280 K. By how much would the temperature of the hot reservoir need to be raised (in K) in order to increase the efficiency of the heat engine to 35.6 %?

Explanation / Answer

Let the heat discharged be Q

Work=Qhot-Q

Q=20037.5 J

(iv) Eficiency=(Th-Tc)/Th

Tc=280 K

eficiency=15

we got Th=329.4 K

for eficiency=35.6 percent

Th=434.8 K

so temp must be raised by 105.4 K

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.