Distinguishing Types of Mirrors Light is coming from the left; which is a concave mirror?
1 answer:
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Answer:
The wife have to sit at 0.46 L from the middle point of the seesaw.
Explanation:
We need to make a sketch of the seesaw and the loads acting over it.
And by the studying of the Newton's law we can find the equation useful to find the distance of the mother sitting on the seesaw with respect to the center ot the pivot point.
A logical intuition will give us the idea that the mother will be on the side of her son to make the balance.
The maximum momentum with respect to the pivot point (0) will be:
Where L/2 is the half of the distance of the seesaw
Therefore the other loads ( mom + son) must be create a momentum equal to the maximum momentum.
Complete Question
The complete question is shown on the first uploaded image
Answer:
A
The potential of this system is
B
The electric potential at point p is
C
The work required is
D
The speed of the charge is
Explanation:
A sketch to explain the question is shown on the second uploaded image
Generally the potential energy for a system of two charges is mathematically represented as
where k is the electrostatic constant with a value of
q is the charge with a value of
d is the distance given as
Now we are given that and
and
Now substituting values
The electric potential at point P is mathematically obtained with the formula
I.e the potential at plus the potential at
Now potential at is mathematically represented as
and the potential at is mathematically represented as
Now substituting into formula for potential at P
The Workdone to bring the third negative charge is mathematically evaluated as
From the Question are told that the charge would a force and an acceleration which implies that all its potential energy would be converted to kinetic energy.This can be mathematically represented as
Where
Now making v the subject we have
