During the time that the blocks are in contact, describe whether the center of mass of the two-block system is speeding up, slow
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.
Answer:
The current in the second wire is 8.33 A and the two currents are flowing in the opposite directions
Explanation:
Given that,
The separation between two long parallel wires, d = 2.5 cm
The force per unit length that each wire exerts on the other is,
The current in one wire,
(a) The force per unit length of the wire is given by :
On putting all the values we get :
So, the current in the second wire is 8.33 A.
(b) It is given that, both the wires repel each other, so the current in other wire is flowing in the opposite direction of the current in the first wire.
Hence, this is the required solution.