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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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.
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.
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.
no it does not remain contant.
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.