The Roche limit mainly depends on the mass and density of the celestial bodies involved.
The weight limit for a 2x2 pine board that is 3 feet long would depend on the grade and quality of the pine, as well as any additional supports or structures it is attached to. As a general guideline, a standard-grade pine board of this size may be able to support around 50-100 pounds evenly distributed, but it is always best to consult a structural engineer for specific weight limit calculations.
"Pushed to the Limit" was created in 2010.
"Is mainly due" is the correct phrasing. The verb "due" should follow the adverb "mainly" in this context.
Proportionality limit is the point upto which the stress remains directly proportional to strain whereas elastic limit is the point upto which the material remains elastic ie. if the stress is removed within elastic limit, then the material will regain its original shape and size.
When a spring is stretched beyond its limit, it reaches a point where it can no longer return to its original shape. This is known as the spring's elastic limit. If the spring is stretched beyond this limit, it will permanently deform or even break.