I think your question should be:
An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is
What is the rms value of (a) the electric field and
(b) the magnetic field in the electromagnetic wave emitted by the laser
Answer:
a)
b)
Explanation:
To find the RMS value of the electric field, let's use the formula:
Where
;
;
Therefore
b) to find the magnetic field in the electromagnetic wave emitted by the laser we use:
;
;
The speed of the dragster after travelling 325 m is still 45 m/s
Explanation:
In this problem, we are told that the dragster is travelling at constant rate, therefore its speed is constant and it is
v = 45 m/s
Therefore, its speed will remain constant during the entire motion: therefore, after having travelled for 325 m, its speed will still be 45 m/s.
We can also calculate the time taken for the dragster to cover the 325 m. In fact, the speed in a uniform motion is given by
where:
v is the speed
d is the distance covered
t is the time elapsed
In this case, we have:
v = 45 m/s
d = 325 m
Solving for t, we find:
Learn more about speed:
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