See this suggested solution.
1. Let a force F' is the vector sum of the forces P and Q, then it is shown on the attached picture and marked with red color.
2. according to the condition the force F holds the object, then F should have the same length as the force F' and the opposite direction.
3. using the conditions described in 2. the answer is C.
Answer:
Explanation:
To solve this exercise it is necessary to take into account the concepts related to gravitational potential energy, as well as the concept of perigee and apogee of a celestial body.
By conservation of energy we know that,
Where,
Replacing
Our values are given by,
Replacing at the equation,
Therefore the Energy necessary for Sputnik I as it moved from apogee to perigee was
Explanation:
Given that,
Distance between two long wires, d = 16 cm = 0.16 m
Current in one wire,
Current in wire 2,
The magnetic force per unit length of one wire on the other is given by the following expression as :
The current is flowing in opposite direction, the magnetic force acting on it is repulsive. Hence, this is the required solution.