A train passes by a little boy at the depot. As it moves away from the boy at 65
m/s, the whistle emits a frequency of 4500hz.
What frequency does the little boy hear as
the train barrels off into the distance? The speed
of sound in air is 343m/s

Electoral current force mechanical advantage if the wheel and axle is 2 n and the output force is 20 n

Answer: 1.4 seconds which is the third optionexplanation: current is defined as the flow of charge per timetherefore, the equation that relates current, charge and time can be expressed as follows: i = δq / δtwhere: i is the current given = 1.8 ampereδq is the charge given = 2.5 coulombδt is the time required for the flow of the given charges to give the 1.8 ampere.substitute with the givens in the above equation to get the time as follows: 1.8 = 2.5 / δtδt = 2.5 / 1.8 = 1.38888 which is approximately 1.4 secondshope this was !

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