How much power is generated if 375 J of work is done in 15 s?
1 answer:
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Here are the missing questions:
(a) How fast is the skier moving when she gets to the bottom of the hill?
(b) How much internal energy was generated in crossing the rough patch?
Part A
The initial kinetic energy of the skier is:
Part of this energy is then used to do work against the force of friction. Force of friction on the horizontal surface can be calculated using following formula:
The work is simply the force times the length:
So when the skier passes over the rough patch its energy is:
When the skier is going down the skill gravitational potential energy is transformed into the kinetic energy:
So the final energy of the skier is:
This energy is the kinetic energy of the skier:
Part B
We know that skier lost some of its kinetic energy when crossing over the rough patch. This energy is equal to the work done by the skier against the force of friction.
(a) How fast is the skier moving when she gets to the bottom of the hill?
(b) How much internal energy was generated in crossing the rough patch?
Part A
The initial kinetic energy of the skier is:
Part of this energy is then used to do work against the force of friction. Force of friction on the horizontal surface can be calculated using following formula:
The work is simply the force times the length:
So when the skier passes over the rough patch its energy is:
When the skier is going down the skill gravitational potential energy is transformed into the kinetic energy:
So the final energy of the skier is:
This energy is the kinetic energy of the skier:
Part B
We know that skier lost some of its kinetic energy when crossing over the rough patch. This energy is equal to the work done by the skier against the force of friction.
<h2> F = k×
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Explanation:
- The attractive or repulsive forces which act between any two charged species is an electric force.
- The electric force depends on the distance between the charged species and the amount of charge which can be calculated by the formula given as follows
F = k×
where, K is coulombs constant, which is equal to - 9 x10^9
- The unit for K is newtons square meters per square coulombs.
- This is known as Coulomb's Law.