Which of the following must be true of a person who shares the same reference frame as you?

a) the person must be sitting right next to you
b) the person must be the same size as you
c) the person must not be moving relative to you.

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

Which articulations allow for greatest range of motion?

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.