Final answer:
A heavy load is often defined as 85% or more of an individual's 1RM in weightlifting. The specific number can vary based on training protocols. The question about the copper wire does not provide sufficient information to calculate the weight of the load without knowing the modulus of elasticity for copper.
Step-by-step explanation:
A heavy load is typically defined as a high percentage of one's one-repetition maximum (1RM), which is the maximum amount of weight one can lift in a single repetition for a given exercise. While the exact percentage can vary, a heavy load is often considered to be 85% or more of one's 1RM. For more specific training protocols or exercises, this percentage might be adjusted.
In the context of the provided example, where the amount of weight lifted increased from 205 pounds to 295 pounds after the class, we can use these figures to demonstrate progress in strength. However, these numbers alone do not define a heavy load as a percentage of 1RM unless we know the actual 1RM.
Regarding the copper wire question, without the necessary constants and formulas, including the modulus of elasticity for copper, it's impossible to calculate the weight of the load with provided data alone. This type of problem would typically involve calculating the force based on the material's properties and the strain it underwent.