Answer:
<u>At a given temperature</u>
Resistivity depends only on the material and resistance depends on resisitvity, length of the wire and cross-sectional area of the wire
Explanation:
At a given temperature the resistance of a specimen with unit length and unit cross sectional area is called resisitivity.
We get
R = ρl/A
where; R = resistance
ρ = resistivity
l = length of the wire
A = cross-sectional area of the wire
So you get, ρ ∝ 1\l
ρ ∝ A
ρ ∝ R
The answer
<em>The temperature of substance B will increase more rapidly than the temperature of substance A will.</em>
hope this helps
The work done in stretching the spring from 50 cm to 80 cm is 67.5 J.
<h3>Hooke's Law</h3>
Hooke's law states that the force applied to an elastic material is directly proportional to its extension, provided its elastic limit is not exceeded.
To calculate the amount of work done by Hooke's law, first, we need to find the force constant of the spring.
Formula:
- F = ke................. Equation 1
Where:
- F = Force applied
- k = Spring constant
- e = extension
make k the subject of the equation
- k = F/e................ Equation 2
From the question,
Given:
- F = 450 N
- e = 30 cm = 0.3 m
Substitute these values into equation 2
Finally, To find the work done in stretching the spring from 50 cm to 80 cm, we use the formula below.
- W = ke²/2........... Equation 3
Where:
- W = Work done
- k = spring constant
- e = extension
Also, From the question,
Given:
- e = (80-50) = 30 cm = 0.3 m
- k = 1500 N/m
Substitute these values into equation 3
- W = 1500(0.3²)/2
- W = 67.5 J.
Hence, The work done in stretching the spring from 50 cm to 80 cm is 67.5 J.
Learn more about Hooke's law here: brainly.com/question/12253978
Electromagnetic is the relationship exists between wavelength and frequency.
