The drawing shows six point charges arranged in a rectangle. the value of q is 1.02 μc, and the distance d is 0.226 m. find the total electric potential at location p, which is at the center of the rectangle.

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

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 answer is: c. from underground