A 0.075-kg toy airplane is tied to the ceiling with a string. When the airplane's motor is

Question:

A 0.075-kg toy airplane is tied to the ceiling with a string. When the airplane's motor is started, it moves with a constant speed of 4.47 m/s in a horizontal circle of radius 1.28 m, as illustrated in FIGURE 6-65.
(a) The angle the string makes with the vertical
(b) The tension in the string.