An train car of total mass of 13000 kg is pulling into a station and slowing down with an acceleration of -4.56 m/s^2. Before th
e train pulls into the station, a group of 7 stowaway jump off the train. Each stowaway has a mass of 66 kg. If the braking force on the train remains the same, what will be the acceleration of the train once the stowaways jump out of the train?
1 answer:
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1) Destructive interference
The condition for constructive interference to occur is:
(1)
where
is the path difference, with
is the distance of the point from the first source
is the distance of the point from the second source
m is an integer number
is the wavelength
In this problem, we have
So let's use eq.(1) to see if the resulting m is an integer
It is not an integer so constructive interference does not occur.
Let's now analyze the condition for destructive interference:
(2)
If we apply the same procedure to eq.(2), we find
which is an integer: so, this point is a point of destructive interference.
2) Constructive interference
In this case we have
So the path difference is
Using the condition for constructive interference:
Which is an integer, so this is a point of constructive interference.
3) Destructive interference
In this case we have
So the path difference is
Using the condition for constructive interference:
This is not an integer, so this is not a point of constructive interference.
So let's use now the condition for destructive interference:
which is an integer: so, this point is a point of destructive interference.
Answer:
24 N
Explanation:
= mass of the cube =
Consider the three cubes together as one.
= mass of the three cubes together =
= acceleration of the combination = 2 ms⁻²
= Force applied on the combination
Using Newton's second law
= Force by the left cube on the middle cube
Consider the forces acting on left cube, from the force diagram, we have
