Answer:
v' = 14.76 m/s
Explanation:
given,
frequency of the one truck = 206 Hz
apparent frequency ,f' = 189 Hz
speed of sound, v = 343 m/s
speed of observer (v_o)and source (v_s) = v'
now, using Doppler's effect
314.69 + 0.9174 v' = 343 - v'
1.9174 v' = 28.30
v' = 14.76 m/s
hence, the speed of the truck is equal to 14.76 m/s
B.Power is the force of work over a certain distance.
C.Power is the rate at which work is accomplished.
D.Power is the energy supplied in a force.
B) burning paper
C) film being exposed to light
D) a piece of paper being cut in half
It *can* be called "Dynamic Electricity".
Hope that helps a little bit XD.