When calculating the angular velocity of the Earth as it completes a full rotation on its own axis (a solar day), this equation is represented as: Ï avg = 2Ïrad/1day (86400 seconds), which works out to a moderate angular velocity of 7.2921159 Ã 10 -5 radians/second.
Roof sarking is a membrane that is fitted during tile or metal roof construction. The flexible membrane is usually installed under the battens to provide thermal insulation and to prevent water and dust penetration in the roof space.In bushfire prone areas flying embers cannot enter this space through the roof due to sarking protection.he flexible membrane is usually installed under the battens to provide thermal insulation and to prevent water and dust penetration in the roof space. In bushfire prone areas flying embers cannot enter this space through the roof due to sarking protection.
Sarking is an English word with multiple meanings in roof construction: 1  the use of wood panels, or sarking boards, called sheathing, sheeting or decking in American English, under the roof covering materials such as the shingles of a roof to provide support.2  It is a common term in Scotland, Australia, and New Zealand. The word sarking is further used as part of the term scrim and sarking, a method of interior construction widely used in Australia and New Zealand in the late 19th and early 20th centuries.