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What does the expression mean cream puffs on a lower shelf?
That sounds like a cooking instruction for a non-fan oven. Without a fan there are temperature zones in a [gas] oven with the lower shelves at a lower temperature than the higher shelves. In a gas cooker, the setting for gas mark is [usually] the centre shelf; the top shelf is about 1 to 11/2 gas marks higher (about 25-37oF, 14-21oC hotter), the bottom shelf is about 1 to 11/2 gas marks lower (about 25-37oF, 14-21oC cooler) - the differences will be in the cooker's manufacturer's instructions. By putting the cream puffs of a lower shelf, they are baked at a lower temperature than that at which the oven has been set, allowing the baking of something else on a higher shelf at a higher temperature at the same time.
The kinetic energy of a book on a shelf is equal to the work done to lift the book to the shelf?
no, but the POTENTIAL energy may equal the work done to life the book to the shelf
At first it is lifted to one shelf then it is lifted again to a second higher shelf based on the numbers that are obtained from the work calculations what is a correct conclusion?
The weight changes as the objectis lifted
Does a book sitting on a shelf have gravitational potential energy?
YES!
How many 12 inch by 12 inch boxes can fit on a 2 foot by 3 foot shelf?
2 foot by 3 foot means its just two dimensions. because you said shelf i am a bit confused. when you say shelf i think of something coming off the ground having a third dimension. a 12 inch by 12 inch box means the volume of the box is 1 foot by 1 foot by 1 foot. your shelf is 2 foot wide and 3 feet high... how deep is it? telling the depth will let someone know how many rows they are allowed to put but if your shelf is two-dimensional... which doesnt sound correct... you can put 6 boxes in that shelf.
