What is the question? It doesn't seem like the whole thing is there.
Is this a question or a statement. This statement would be incorrect. <span />
Explanation:
Power is the rate of change of force dotted into displacement which is added to the force dotted to the rate of change of displacement.If the force is constant, then you get the instantaneous power is the force dotted to the instantaneous velocity.
Answer:
(a) 1782 Hz (b) 2178 Hz
Explanation:
The predominant frequency =1980 Hz
The speed of the police car =34.3 m/sec
The speed of sound in air =343 m/sec
(a) When the car moves towards you
According to Doppler's effect
(b) When the car moves away from you