Answer:
548.5 Hz
Explanation:
We are given that
Frequency of source=500 Hz
Speed of train=30m/s
Speed of sound in air=339m/s
We have to find the frequency of the bell to an observer riding the train.
The apparent frequency for the listener

Where
Frequency of source
=Speed of sound
=Speed of source
Using the formula
The apparent frequency of the bell to an observer riding the train=
Hence, the apparent frequency of the bell to an observer riding the train=548.5 Hz
Answer:
Option A is correct.
Eddies due to enhanced mixing of fluid
Explanation:
Turbulent thermal conductivity is thermal conductivity that arises from the turbulent flow of fluids. It comes into play when a particukar fluid moves into turbulent regiom of flow where flow is no longer orderly and streamlines aren't discernable with the fluid layers all warping into one another forming vortices.
It is represented as K and is shown mathematically through the heat flux at turbulent flow
q = vCρT' = - K (∂T/∂y)
where
K = turbulent thermal conductivity
T' = the eddy temperature relative to the mean value,
C = Heat capacity the fluid
q = the rate of thermal energy transport by turbulent eddies.
The physical mechanism that cause turbulent thermal conductivity are similar to the causes of turbulent flow of fluids.
This includes sharp changes in fluid pressure and velocity of flow which is evident in eddies that come about in the enhanced mixing of fluids.
Hope this Helps!!!
It is referred to as humidity. Hope I helped!
Let the Blaise runs for time "t" to complete the race
so the total distance he moved is given by

Now Issac runs for time t = "t - 2*60"
because it took rest for 2 minutes

now it is given that Blaise wins by 10 m distance




now the distance moved by Blaise is given by
