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Leto [7]
3 years ago
11

Given equation is F=mv ×v/R what is the relationship exist between F and R?

Physics
1 answer:
irina [24]3 years ago
8 0
This is called an "inverse" relationship because the bigger R becomes, the smaller F becomes as a result. you can do a couple of calculations on your calculator to see this (just increase R and watch what happens to F).

Also, when an equation has F = (x.y)/R^2  we call this the "inverse square" relationship, since it is also inverse, but squared. In practice it means that every time you double R, F decrease by 4 times! You will see this in physics a lot, so it's good to know!
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A kettle is rated at 1 kW, 220 V. Calculate the working resistance of the kettle.
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Explanation:

Power of electric kettle, P = 1 kW

Voltage, V = 220 V

(a) Electric power is given by the formula as follows :

P=\dfrac{V^2}{R}

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R=\dfrac{V^2}{P}\\\\R=\dfrac{(220)^2}{10^3}\\\\R=48.4\ \Omega

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