Jean-Luc likes to run errands on Saturday mornings. He leaves his house at 10:00 a. m. and first heads to the post office to mail a package. Then, he heads to the pet store to buy food for his goldfish. • a. What is the distance of this trip?
• b. What is his displacement when he is at the post office?

Answer:   [a]:   "slate" .

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.

Ithink the answer would be a