Reducing friction in a machine
a. decreases its actual machine advantage
b. decreases the work output
c. increases its efficiency
d. increases its ideal mechanical advantage

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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.

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?