Answer : The value of momentum is
and m = 3.735 and n = 7
Explanation : Given,
Mass of high speed train = ![4.5\times 10^5kg](https://tex.z-dn.net/?f=4.5%5Ctimes%2010%5E5kg)
Velocity of train = ![8.3\times 10^1m/s](https://tex.z-dn.net/?f=8.3%5Ctimes%2010%5E1m%2Fs)
Formula used :
![p=mv](https://tex.z-dn.net/?f=p%3Dmv)
where,
p = momentum
m = mass
v = velocity
Now put all the given values in the above formula, we get:
![p=(4.5\times 10^5kg)\times (8.3\times 10^1m/s)](https://tex.z-dn.net/?f=p%3D%284.5%5Ctimes%2010%5E5kg%29%5Ctimes%20%288.3%5Ctimes%2010%5E1m%2Fs%29)
![p=3.735\times 10^7kg.m/s](https://tex.z-dn.net/?f=p%3D3.735%5Ctimes%2010%5E7kg.m%2Fs)
Therefore, the value of momentum is
and m = 3.735 and n = 7
Well you know the formula is,
Power= Work/Time
So as time increases, Power Decreases, it's an inverse relationship.
Think about it like this, to have more "power" you have to be able to do a lot in a short amount of time, so by spending more time on something, your power decreases.
Answer:
The mass of the copper is 3.00kg
Explanation:
The effiency of a machine is
(output work or energy) / (input work or energy) .
For the system described in the question, that's
(123 J) / (150 J) = 0.82 = 82% .