Final answer:
Without knowing the starting point of the nail on the scale, it is not possible to determine at which point the tip of the nail will be. If the starting point is known, adding 6 cm to this point will give the location of the tip.
Step-by-step explanation:
To determine at which point the tip of a 6 cm long nail will be when it is covered by a piece of paper, one must align the nail with the scale, ensuring that the starting point of the nail (the end opposite the tip) is positioned at a specific measurement mark. Without additional information, such as where the nail begins on the scale, it is not possible to ascertain the exact position of the tip on the scale. However, if the nail's starting point on the scale is known, you would simply add 6 cm to that measurement to find the point where the tip will be. For instance, if the nail starts at the 2 cm mark, the tip would be at the 8 cm mark. This process involves some fundamental principles of measurement commonly used in experiments and constructions involving physical objects.