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dr/dt propto -1/r^2 and integrate to find equation linking radius and time with boundary conditions. Set r = 0, answer is 7mins 37 seconds.

A market equilibrium occurs when the buyers and sellers in the market are satisfied.
We can also think about an equilibrium in terms of supply and demand. Let's think about a market for Fanta cans, w...

First write down any two factors of 36 (numbers that multiply together to give 36). Let's use 2 x 18. We now need to break these numbers down into prime factors. 2 is already a prime number, so we only ne...

Language analysis questions may seem daunting, but as long as you have a good understanding and knowledge of the text then there is no need to worry. Teachers and examiners are looking for answers that ar...

Number of cell divisions: there is 1 cell division in mitosis and 2 in meiosis. Daughter cells: mitosis produces 2 daughter cells genetically identical to each other and the parent cell, whereas meiosis p...