Apollo 9 launched in 1969. Its mission was to test the lunar model, the part of the space vehicle that would take the astronauts to the moon. The astronauts in the lunar module tested its engines and equipment while they orbited Earth. Which specific NASA goal did Apollo 9’s mission focus on?

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.