Problem F14-9 Dynamics Hibbeler 13th (Chapter 14) Engineering Dynamics - Power and Efficiency

[@mikec9333]

Thank you!

[@ajwhite5471]

Why does it have no acceleration???

[@theengineeringcrucible3490]

The problem states "constant velocity", this means no acceleration. Remember that acceleration is time derivative of velocity, but if velocity doesn't change (constant), then the derivative of a constant is zero.

[@hakankaygsz7844]

@@theengineeringcrucible3490 if we change the question like that the speed of load is 0 (standing position) and we want to accelerate 3 ft/s and wind at that speed. How can we determine the power supplied to the motor?

[@ravirajac]

@@hakankaygsz7844 use m.ay and substitute ay = 3ft/s^2, I assume you meant accelration = 3ft/s^2

[@aryadwi2653]

can u explain again for f(3) = 200 iam sorry till cant understand

[@theengineeringcrucible3490]

I had F*v = Power, so Force of 200lbs and velocity of 3 ft/s gave me a power output of 600 lbft/s