18. [2pt] A particular heat engine has an efficieny of 40%. If this heat engine

Question

18. [2pt]
A particular heat engine has an efficieny of 40%. If this heat engine does 32 kJ of work in a cyclical process, how much heat is transferred to the environment (to the cold reservoir)?

Answer:  Last Answer: 80 kJ
Not yet correct, tries 4/20

24. [2pt]
A 1.40 m by 2.00 m slab of steel is heated on one side to 560 deg. C. If the steel slab is 1.90 cm thick and the other side is at a temperature of 29 deg. C, what is the rate of heat transfer through the steel?

Answer:  Last Answer: 3.928E+06 W
Not yet correct, tries 1/20

Answer:  Last Answer: -1.6E-07 N
Not yet correct, tries 0/20

26. [2pt]
Two current carrying wires, with currents 2.0 A and -1.0 A respectively, lie 30.0 cm apart. Calculate the force acting on a 12.0 cm long piece of the second wire, taking an attractive force as being negative.

Answer:  Last Answer: 13.33E-07 N/m
Not yet correct, tries 0/20

Explanation / Answer

C1 = 230 F, C2 = 140 F and C3 = 420 F and C4 = 360 F,
C3 and C4 are in parallel

Hence C34 = 420 + 360 = 780

C34 and C2 are in series hence

1/C234 = 1/C34 + 2/C2

1/C234 = 1/780 + 1/140

C234 = 2730/23

C1 and C234 are in parallel

Cnet = C1 + C234

Cnet =230 + 2730/23

Cnet = 348.69 F

Post separate questions for each of the questions

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

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