How do you calculate the magnitude of a force?

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Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?

Auniform crate c with mass mc is being transported to the left by a forklift with a constant speed v1. what is the magnitude of the angular momentum of the crate about point a, that is, the point of contact between the front tire of the forklift and the ground