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Let’s take a look at how to calculate the time it takes to do work. Recall that a rate can be used to describe a quantity, such as work, over a period of time. Power is the rate at which work is done. In this case, rate means per unit of time. Power is calculated by dividing the work done by the time it took to do the work.
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Physicists define work as the amount of energy transferred by a force. Learn about the formula for calculating work, and how this relates to the work-energy principle, which states that the net work done on an object is equal to the change in its kinetic energy.
30 cze 2018 · Your answer is correct - assuming no other force act. The general statement: W = F ⋅ s W = F ⋅ s. holds for the work done by the force F F but also permits other forces to be present.
Work (W) =[latex]\overrightarrow{F} •\overrightarrow{d} or\overrightarrow{F}\overrightarrow{d}[/latex] cosØ W = ∆ Energy. Power (P) =[latex]\overrightarrow{F} •\overrightarrow{v}[/latex] Power (P) = [latex]\dfrac{W}{t} =\dfrac{\Delta{Energy}}{t}[/latex]
One way to calculate this is to find the area under the power vs time curve (which gives the total work done) and divide by the total time. This is usually best done with calculus, but it is often possible to estimate it reasonably accurately just using geometry.
20 lut 2022 · The translational kinetic energy of an object of mass \(m\) moving at speed \(v\) is \(KE = \frac{1}{2}mv^2\). The work-energy theorem states that the net work \(W_{net} \) on a system changes its kinetic energy, \(W_{net} = \frac{1}{2}mv^2 - \frac{1}{2}mv_0^2\). 7.3: Gravitational Potential Energy Work done against gravity in lifting an object ...
We can use the work-energy theorem to calculate the work done by the motor, and then divide by time to calculate the power. The work is equal to the change in kinetic energy. Because the golf cart was initially at rest, the initial KE is zero.
