A crane can lift one cement block at a time from the ground weighing 200kg eachThe crane picks up one block vertical off the groundWhen the block reaches 39m above the ground (while still moving upwards), 'n small piece of the chain (1kg) holding the block in place falls off and hits the ground 3 seconds laterIgnore all wind Resistance.1How long after the chain came loose, will the distance between the block and the chain be 16m?2What will the speed of the chain be as it hits the ground?
HuhI've used paper or (in some cases) pieces of woodI've never used parchamentI suppose it all comes down to what you are doing and what feels right to youAlso depends on which rings truer for you: investment of materials or investment of your own time, energy and creativityIf I had a better idea of the work that you intend, I might be able to give you a more specific answer.
Parchment paper, like any other component, is not essential for spell casting (at least in my experience)Ordinary paper will work just as wellOr no paper at all.
Just use a silicone mat , or non-stick baking sheetI love parchment paper it makes cake and muffins just pop outand you can make sticky candy on it tooYou can oil brown paper bags for an old' time hint-use a clean lunch bag cut open.
1Find the original velocity firsty Vot + (1/2)at^2 where y -39 m, Vo ?, a -g, and t 3sRepeat that equation with y 16 m and Vo the result from above2Vf^2 Vo^2 + 2as
