A large cooler is filled with water, as shown below. A large yellow cooler with a white valve at its bottom. How does the valve on the cooler compare with the switch in an electric circuit? Opening the valve allows water to flow, just like opening a switch allows charges to flow. Opening the valve stops the flow of water, but closing a switch stops the flow of charges. Closing the valve stops the flow of water, but opening a switch stops the flow of charges. Closing the valve allows water to flow, just like closing a switch allows charges to flow.

Review multiple-concept example 7 in this chapter as an aid in solving this problem. in a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. in one instance, the radius of the circle is 0.626 m. at one point on this circle, the ball has an angular acceleration of 66.1 rad/s2 and an angular speed of 12.6 rad/s. (a) find the magnitude of the total acceleration (centripetal plus tangential) of the ball. (b) determine the angle of the total acceleration relative to the radial direction.