Final answer:
The range of a projectile is zero at launch angles of 90° and 0°. The maximum range of a projectile launched from level ground is achieved at a 45° angle. Additionally, the perpendicular component of weight for a box on an incline is maximized at an angle of 90°.
Step-by-step explanation:
Projectile Launch Angles and Optimal Ranges
The proper position of holes on air spring brake chambers is not directly related to projectile motion; therefore, the list provided seems to be a mix-up with a different technical subject. Instead, let's focus on the physics-related questions about projectile motion and incline angles.
For what angle of a projectile is its range equal to zero? The correct answer is c. 90° or 0°. A launch angle of 90° indicates that the projectile is shot straight up and comes back down to its launch position, while a 0° angle indicates the projectile is launched horizontally, instantly hitting the ground.
The GRASP CHECK question asks about the launch angle that maximizes the range of a projectile. The optimal angle for this is c. 45°, as it provides the perfect balance between vertical and horizontal displacement, resulting in the greatest range.
The optimum angle at which a projectile should be launched to cover the maximum distance is also b. 45°, confirming the same principle of the balance between the vertical and horizontal components of the launch velocity.
Lastly, a box on an inclined plane will have the perpendicular component of its weight at maximum when the angle of the incline is d. 90°, effectively making the plane vertical and the weight's entire force perpendicular to the surface.