A train whistle is 580 Hz when stationary. It is moving away from you at 18.8 m/s. What frequency do you hear?
1 answer:
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The motion of the light is a uniform motion with constant speed 
, therefore we can use the basic relationship between speed, space and time:
(1)
where S is the distance covered and t is the time taken. The light takes t=1.3 s to travel from the moon to Earth, therefore by rearranging eq.(1) we can find the distance between the Moon and the Earth:
where S is the distance covered and t is the time taken. The light takes t=1.3 s to travel from the moon to Earth, therefore by rearranging eq.(1) we can find the distance between the Moon and the Earth:
To develop the problem it is necessary to apply the concepts related to Magnetic Field.
The magnetic field is defined as
Where,
Permeability constant in free space
r = Radius
I = Current
Our values are given as,
B = 0.1T
d = 4.5mm
r = 2.25mm
If the maximum current that the wire can carry is I, then
Therefore the maximum current is 1125A