When the compasses are moved close to a wire with a current which will the compasses point
2 answers:
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Answer:
0.037 N/m
Explanation:
The web acts as a spring, so it obeys Hook's law:
(1)
where
F is the force exerted on the web
k is the spring constant
x is the stretching/compression of the web
In this problem, we have:
- The mass of the fly is
- The force exerted on the web is the weight of the fly, so:
- The stretching of the web is
So if we solve eq.(1) for k, we find the spring constant:
When you have to convert a quantity you need to multiply by a fraction whose value is 1 but has different units of measurements.
In your case you have:
You will have two fractions: one that transforms grams into kilograms and one <span>that transforms</span> cm³ into m³. You need to position the quantities in such a way you can eliminate the original ones, therefore:
Now, you can make the calculations and you get:
= 
Therefore your answer is: 1000kg/m³
In your case you have:
You will have two fractions: one that transforms grams into kilograms and one <span>that transforms</span> cm³ into m³. You need to position the quantities in such a way you can eliminate the original ones, therefore:
Now, you can make the calculations and you get:
Therefore your answer is: 1000kg/m³