2points
a small car increases its speed from 10 m/s to 15 m/s. its mass is 1,200 kg.
what is the impulse?
o
a. 1,200 kg. m/s
o
b. 12,000 kg. m/s
c. 6,000 kg-m/s
o
o
d. 18,000 kg-m/s
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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.