1. Imagine your lab partner flicks a paper football from their desk into the air. If the paper football has a mass of 0.05 kg and starts at rest, then what is the initial momentum of the football?

Iwould have to say sorry i can't elaborate more. hope this though!

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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.

Answerthe distance between the two ends of the galaxy is 150,000 light years;