A light day moves through air and approaches a body of water at an angle of 30 degrees. Find the angle of refraction (n=1.00 air) (n=1.33 water)

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.

The fertilized egg  begins to develop into a hollow ball of cells called the blastocyst. 

It maybe because uranus is made of gas but uranus has a solid core in the middle