Weighing The Options

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A Challenge Question ...

Weighing The Options

Consider a good, old-fashioned spring-balance. The more you hang from it, the larger the reading. Suppose it's been calibrated, and when you hang one kilogram from it the dial reads 1kg.

Now look at the arrangement we have here on the right. We have two frictionless pulleys and a light, inextensible string such as is only ever found in a physics textbook. We put the (effectively massless) spring balance in the middle, and we hang a kilogram from each end of the string.

What reading do we get?



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