P= F(t) • V(t) vs P = F • V to find power done

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SUMMARY

The power delivered as a function of time can be calculated using the equation P = F(t) • V(t), where F(t) = m(12t-8) and V(t) = (6t^2-8t). In this context, since both force and velocity are expressed as scalar functions rather than vectors, the correct approach is to multiply them directly. This indicates that all motion and force operate in a single dimension, simplifying the calculation of power over time.

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Homework Statement


What is the power delivered as a function of time?

F(t) = m(12t-8)
V(t) = (6t^2-8t)

Homework Equations


P = FV vs. P = F • V

The Attempt at a Solution


I'm given a force and velocity as functions of time. When I find power, do I multiply or dot them? I know you should dot when force and velocity are defined vectors, but here they are generalized and not represented by vectors but actually by functions.
 
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Just multiply them. If they are given as scalar functions rather than vectors, it is implicit that all motion and force operates in a single dimension.
 
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andrewkirk said:
Just multiply them. If they are given as scalar functions rather than vectors, it is implicit that all motion and force operates in a single dimension.
Right... these are only in terms of a single dimension and vary with time - I don't know what was going on with my brain there. Thanks!
 

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