I don't know why the answer is D , because I can't see the list of choices.
The only way to get 8.0 Amps is by making a serious mistake.
The current in the second picture is 4.0 Amps.
If the resistors are identical, then the effective resistance of
two resistors in parallel is 1/2 the resistance of each one.
The resistance in the second picture is 1/2 the resistance
in the first picture.
Current = (voltage) / (resistance)
Cutting the resistance in half causes the current to double.
If the current was 2.0 Amps in the first picture, it's 4.0 Amps
in the second picture.
When the moon is between the sun and the earth.
Answer:
There are finally 4 rotations per second.
Explanation:
If a trapeze artist rotates once each second while sailing through the air, and contracts to reduce her rotational inertia to one fourth of what it was. We need to find the final angular velocity. It is a case of conservation of angular momentum such that :

Let
,
and 
So,



So, there are finally 4 rotations per second. Hence, this is the required solution.
Answer:
New force = 9(initial force)
Explanation:
The force between two charges is given by :

Where
d is the original distance
Let d' is the new distance such that, r' = r/3
New force,

So, the new force becomes 9 times the initial force.