The frequency of the first harmonic of a standing wave on a wire is . The length of the wire and tension in the wire are both doubled.
What is the frequency of the first harmonic as a result?
A f/√2
B f
C √2f
D 2f

Velocity is the speed of an object in a certain direction so you'd need to know speed and direction

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.

Cvelocity of the