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
Answer:
a ) I= 1.635-i0.0021 b) ∅= -0.074
Explanation:
a) reactive impeadance= 2πfL
=2(3.14)(147)(0.158)
=145.86 Ω
Z= 171+j145.86
I=V/Z
I=278/(171+j145.86)
I= 1.635-i0.0021
b) ∅=inv.tan (-0.0021/1.635)
∅=-0.074
Answer:
Explanation:
The electrical reactance is defined as:
Where:
So, replacing the data provided by the problem:
Now, the impedance can be calculated as:
Where:
Replacing the data:
In order to find the magnitude of the impedance we can use the next equation:
We can use Ohm's law to find the current:
Therefore the current is:
And its magnitude is:
Finally the phase angle of the current is given by:
Answer:
B
Explanation:
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