If a small child swallowed a safety pin, why
2 answers:
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Answer:
0.104 m
Explanation:
Stress,
Where F is force and A is area. Also, F=mg where m is mass and g is acceleration due to gravity
where
is the elongation and l is the original length
Making the subject then
By substituting the given values and taking g as 9.81 then
To solve this problem we can apply the concept related to thermal expansion, including the analogy with resistance and final intensity.
The mathematical expression that describes the expansion of a material by a thermal process is given by
Where
= Initial resistance
Thermal expansion coefficient
Change in the temperature
If we want to directly obtain the final value of the resistance of the object, you would simply add the initial resistance to this equation - because at this moment we have the result of how much resistance changed, but not of its final resistance - So,
Re-arrange to find the change at the temperature,
Since the resistance is inversely proportional to the current and considering that the voltage is constant then
Then,
<em>(It is possible that there is a typing error and the value is not 4.5 but 4.3, so the closest approximate result would be 1627K and mark this as the correct answer)</em>
The work done by a force when moving an object is given by:
where W is the work, F is the force and d the displacement of the object.
Therefore, using
and 
, we get a total work of
where W is the work, F is the force and d the displacement of the object.
Therefore, using