The picture given here shows part of a skating track inside a campus. Children who are roller-skating come from both directions
as shown by the arrows. Children coming in opposite directions often bang into each other at some point(s) because they are not able to see through the thick bushes and trees on either side of the path. At which point(s) is this MOST likely to happen?
1 answer:
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To solve this problem it is necessary to apply the concepts related to energy conservation.
In this case the kinetic energy is given as
Where,
m = mass
v= Velocity
In the case of heat lost energy (for all 4 wheels) we have to
m = mass
Specific Heat
= Change at temperature
For conservation we have to
Therefore the temperature rises in each of the four brake drums around to 47°C
From the theory we know that:
c = λ / T
f = 1 / T
Where:
c = 3. / m (the speed of light)
λ is the wavelengh (in meters)
T is the period (in seconds)
f is the frequency (in Hz)
We were told that:
f = 7.30 .
And we want to find out the value of λ.
c = λ / T
c = λ . 1/T
Swaping 1/T = f
c = λ . f
λ = c / f
λ = 3 . / 7.30 .
λ = 4.12 m
Response: 4.12 m = 412 nm
:-)