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(II) A pump lifts 21.0 $\mathrm{kg}$ of water per minute through a height of 3.50 $\mathrm{m}$ . What minimum output rating (watts) must the pump motor have?

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12.0$W$

Physics 101 Mechanics

Chapter 8

Conservation of Energy

Work

Kinetic Energy

Potential Energy

Energy Conservation

Moment, Impulse, and Collisions

Rutgers, The State University of New Jersey

University of Michigan - Ann Arbor

Hope College

University of Winnipeg

Lectures

04:05

In physics, a conservative force is a force that is path-independent, meaning that the total work done along any path in the field is the same. In other words, the work is independent of the path taken. The only force considered in classical physics to be conservative is gravitation.

04:30

In classical mechanics, impulse is the integral of a force, F, over the time interval, t, for which it acts. In the case of a constant force, the resulting change in momentum is equal to the force itself, and the impulse is the change in momentum divided by the time during which the force acts. Impulse applied to an object produces an equivalent force to that of the object's mass multiplied by its velocity. In an inertial reference frame, an object that has no net force on it will continue at a constant velocity forever. In classical mechanics, the change in an object's motion, due to a force applied, is called its acceleration. The SI unit of measure for impulse is the newton second.

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Okay. So as ever power will be the amount of energy transformed per time eso energy will be, uh, u H gravitation potential Indian time. This time in mass is 21 kilograms. The exception to the gravity 9.8 meters per second squared height, 3.5 meters. Uh, over of minute which has 60 seconds. Therefore, minimum power operating is 12.0, Watts because you have jewels per second, which is what, and that's it.

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