Final answer:
The minimum working platform for mechanical equipment in an attic depends on local building codes and equipment size, unrelated to mechanical advantage or inclined plane. Fiberglass insulation's impact on heating costs requires an analysis of insulation properties and house temperature dynamics.
Step-by-step explanation:
To determine the minimum working platform for mechanical equipment in the attic, we typically refer to local building codes and regulations. While the question does not provide specifics, generally, the size of this working platform would depend on the equipment size and space needed for a technician to safely perform maintenance or repairs. Although the question seems to be incomplete or lacks context regarding the standards or requirements for such platforms, safety standards often require a stable, level, and adequately sized space. This question is more related to engineering standards, specifically regarding the field of mechanical engineering or building construction.
The provided information on the ideal mechanical advantage and inclined plane does not appear to be directly related to the question of the minimum working platform. Instead, the mechanical advantage and inclined plane are concepts related to physics that describe the efficacy of machines and simple machines respectively. Meanwhile, the input work effort principle is applied generally to define the force needed to perform work across a certain distance.
Touching upon the given scenario of adding fiberglass insulation to the attic, if we assume perfect insulation conditions, no air infiltration, and no heat loss through windows and doors, the heating cost calculation would typically require a more detailed analysis comprising thermal conductivity of materials, the difference in temperature inside versus outside the house, and the efficiency of the heating system. The effectiveness of fiberglass in reducing heating costs is generally measured by its R-value, with higher R-values indicating better insulation and more significant potential for heating cost savings. The percentage drop in heating costs would thus be dependent on these factors rather than the dimensions of the house alone.
In summary, though the question intimates a relationship between mechanical advantage, the working platform in an attic, and the idea of insulation reducing heating costs, it fails to provide a clear, cohesive line of inquiry suitable for a precise calculation or a singular, definitive answer. Questions regarding building construction or insulation effectiveness would require more specific parameters and would generally fall under the expertise of a mechanical engineer, architect, or building construction specialist.