Examlex
A 40-kg crate is being lowered with a downward acceleration is 2.0 m/s2 by means of a rope.
(a) What is the magnitude of the force exerted by the rope on the crate?
(b) What would be the magnitude of the force exerted by the rope if the crate were being raised with an acceleration of 2.0 m/s2?
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A measure of the dispersion or spread of a set of data points, calculated as the average of the squared deviations from the mean.
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