Two point charge
1 answer:
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Answer:
The current through it will also decrease to half of its former value because according to Ohm's law the current flowing through a resistor is directly proportional to the potential difference applied across its ends provided that the temperature and some other necessary conditions remain constant.
This is mathematically represented as follows;
The current is thus given as
if R is constant and V is reduced to half, then we have the following;
Simplifying further we obtain
Equation (3) shows that the current I is also reduced to half.
Answer:
a) The weight and the normal force of the block has a magnitude of 137.298 newtons and the pull force exerted on the block has a magnitude of 98 newtons.
b) The final speed of the block of ice is 9.8 meters per second.
Explanation:
a) We need to calculate the weight, normal force from the ground to the block and the pull force. By 3rd Newton's Law we know that normal force is the reaction of the weight of the block of ice on a horizontal.
The weight of the block (), measured in newtons, is:
(1)
Where:
- Mass of the block of ice, measured in kilograms.
- Gravitational acceleration, measured in meters per square second.
If we know that and
, the magnitudes of the weight and normal force of the block of ice are, respectively:
And the pull force is:
The weight and the normal force of the block has a magnitude of 137.298 newtons and the pull force exerted on the block has a magnitude of 98 newtons.
b) Since the block of ice is on a frictionless surface and pull force is parallel to the direction of motion and uniform in time, we can apply the Impact Theorem, which states that:
(2)
Where:
,
- Initial and final speeds of the block, measured in meters per second.
- Horizontal net force, measured in newtons.
- Impact time, measured in seconds.
Now we clear the final speed in (2):
If we know that ,
,
and
, then final speed of the ice block is:
The final speed of the block of ice is 9.8 meters per second.