To develop more flexibility, this type of stretch should be held for 30-60 seconds.

dynamic

ballistic

static

The answer is static.

Static stretches are ones that are held for an extended period of time to increase flexibility, while other stretches such as dynamic stretches are movements that prepare the body for specific activities.

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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.