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It is an approximate average value for acceleration due to gravity on the surface of the earth. It is affected by altitude, the density of the material near the surface from place to place. And of course, it is totally useless in space, on the moon or Mars.

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Q: What restriction exist in using 9.81 N per kg as the proportionality constant for determining weight?
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What is a non example of a constant of proportionality?

Well, isn't that a happy little question! A non-example of a constant of proportionality would be a relationship where the ratio between two quantities is not always the same. Imagine a situation where the more you paint, the less paint you use each time - that would not have a constant of proportionality. Just like in painting, it's all about finding balance and harmony in the relationships around us.


How do you measure force with a rubber band?

A rubber band will , approximately, stretch an amount "x" in direct proportion to the force "F" applied to it. So you can write this as an equation, F = KX . To find the proportionality constant "K" , hang a known weight "W" from the rubber band and measure the stretch "L". then divide W/L = K . This is called "calibrating" the rubber band.


What is the weight of an seventeen year old?

The average weight of a seventeen year old varies greatly with gender and height, and those two elements are crucial in determining the average weight.


Does the weight of the body remains constant everywhere in the universe?

no it does not remain contant.


What is the formula used to calculate the weight of an object if you are given the mass in kilograms?

Mass is a property of matter and is therefore a constant. Weight however can change, it is the force exerted by that mass in a gravity field. Thus in different gravity fields a constant mass will weigh differently. Weight = Mass * the acceleration of gravity.