find the length of nichrome wire of resistivity 100*10-6ohm-m of cross section 1mm ²to yield a resistance of 10 ohm
1 answer:
1 x 10⁻¹¹m²
Explanation:
Given parameters:
Resistivity = 100 x 10⁻⁶Ohm.m
Cross-section = 1mm²
Resistance = 10ohm
Unknown:
length of the nichrome wire = ?
Solution:
To find the length of the nichrome wire, we use the expression below:
L =
where l is the length of the wire
R is the resistance of the wire
A is the area
p is the resistivity
Now we need to convert area from mm to m;
1000mm = 1 m
1mm² = 1 x = 1 x 10⁻⁶m²
Input the values in the formula;
L = = 1 x 10⁻¹¹m²
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Explanation:
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The forces acting on the beam are the force of the crane up (positive) and the weight of the beam down (negative)
Now in the second part, we use the definition of work, which is equal to the product of the force applied in the direction of displacement, that is, the product of force by distance.
where:
W = work [J]
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d = distance = 66 [m]