1 / 6

6.7  Power

6.7  Power. The idea of power incorporates both the concepts of work and time. Power is work done per unit time. Average power, P is the average rate at which work W is done, and it is obtained by dividing W by the time t required to perform the work:.

richard-dejesus
Download Presentation

6.7  Power

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 6.7 Power The idea of power incorporates both the concepts of work and time. Power is work done per unit time. Average power, P is the average rate at which work W is done, and it is obtained by dividing W by the time t required to perform the work: Power is a scalar. Unit of power: ft.lb/s or watt = W = J/s (SI unit)

  2. Force versus Distance Graph Work = Area under the Force versus Distance graph

  3. Work Done by a Variable Force The work done by a variable force in moving an object is equal to the area under the graph of F cosq   versus s.

  4. Work and the Compound Bow Find the work that the archer must do in drawing back the string of the compound bow in Figure 6.22 from 0 to 0.500 m.

  5. Problem 71 The drawing shows the force-versus-displacement graph for two different bows. These graphs give the force that an archer must apply to draw the bowstring. (a) For which bow is more work required to draw the bow fully from S = 0 to S = 0.5m? Give your reasoning. (b) Estimate the additional work required for the bow identified in part (a) compared to the other bow.

  6. Problem 72

More Related