Lars is jogging besides the railroad tracks at a speed of 2.00m/s when he hears a train whistles behind him at a frequency of 2115hz. if the actual frequency of the train whistle is 2000 hz, how fast is the train moving

The given values on the problem are:

fo = 2000 Hz
f = 2115 Hz
v = 340 m/s
vo = -2.00 m/s

Since vs, or the final speed of the train is asked, we used this equation:

f = fo (v+vo)/(v-vs)

Substituting the give values:

2115 = 2000(340-2)/(340-vs)

By algebra:

vs = 20.4 m/s

Answer: buoyancy forceexplanation: in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.