Final answer:
While the question about the wax applicator does not directly relate to physics and lacks clear context, other provided multiple-choice questions address angles related to projectile motion, forces, and torque in physics, with specific answers indicated in the response.
Step-by-step explanation:
The question regarding the angle at which you should hold the wax applicator is not directly related to physics, and seems out of context with the provided physics-based multiple-choice questions. However, if we consider applying concepts of physics in a practical scenario, we might aim for an angle that ensures the efficient application of wax on the surface, such as 45 degrees, but this is merely interpretive and without a specific physics principle behind it.
Concerning the provided physics problems, the optimum angle for launching a projectile for maximum range is 45 degrees (86.). The angle between tangential velocity and centripetal force is 90 degrees (45.). The range of a projectile is zero at angles of 90 degrees or 0 degrees (69.). For maximizing the projectile's range on level ground, the launch angle should be 45 degrees (GRASP CHECK). The x-component of a vector is greater than its y-component when the angle with the horizontal is less than 45 degrees (40.). Simple harmonic motion models a pendulum well up to roughly 15 degrees (53.). The perpendicular component of a box's weight on an inclined plane is at its maximum at an angle of 90 degrees (73.). Torques on a current loop are given in the context of percentages of their maximum at various angles (46.).