Manganese 25 Mn 54.938 Bohor model
1 answer:
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Answer:
Efriction = 768.23 [kJ]
Explanation:
In order to solve this problem we must use the principle of energy conservation. Where it tells us that the energy of a system plus the work applied or performed by that system, will be equal to the energy in the final state. We have two states the initial at the time of the balloon jump and the final state when the parachutist lands.
We must identify the types of energy in each state, in the initial state there is only potential energy, since the reference level is in the ground, at the reference point the potential energy is zero. At the time of landing the parachutist will only have potential energy, since it reaches the reference level.
The friction force acts in the opposite direction to the movement, therefore it will have a negative sign.
where:
m = mass = 56 [kg]
h = elevation = 1400 [m]
v = velocity = 5.6 [m/s]
I guess the problem is asking for the induced emf in the coil.
Faraday-Neumann-Lenz states that the induced emf in a coil is given by:
where
N is the number of turns in the coil
is the variation of magnetic flux through the coil
is the time interval
The coil is initially perpendicular to the Earth's magnetic field, so the initial flux through it is given by the product between the magnetic field strength and the area of the coil:
At the end of the time interval, the coil is parallel to the field, so the final flux is zero:
Therefore, we can calculate now the induced emf by using the first formula:
Faraday-Neumann-Lenz states that the induced emf in a coil is given by:
where
N is the number of turns in the coil
The coil is initially perpendicular to the Earth's magnetic field, so the initial flux through it is given by the product between the magnetic field strength and the area of the coil:
At the end of the time interval, the coil is parallel to the field, so the final flux is zero:
Therefore, we can calculate now the induced emf by using the first formula: