Calculation

Back to HOME =CALCULATIONS=

__**What is the maximum possible length of a drinking straw? Atmospheric pressure is 101 kPa. State any assumptions you have made**__.
= FORMULA IN WORDS IF IT IS REQUESTED =

We assumed it is possible to create a perfect vacuum. ASSUMPTION
Calculations: always show your working: there are many marks for this even if the answer is wrong. These are the stages: **Formula - Rearrange - Information - Substitute - Calculate - Answer - Unit**
 * Underline**: Show your final answer clearly **highlighting** or underlining.
 * Significant figures:** There are marks for getting this right. Every answer should be given to the correct number of sf (the same sf as the numbers given in the question). eg 5.2*9.8 = 51 (2 sf). It is a good idea to state the sf to show that you know about it.
 * Equations**: if you are asked to write one down, use words not just symbols.
 * Rounding**: if you are asked to show a quantity is 'approximately equal to' a given value, show the rounding step: eg 8.7A (rounded to 9A).
 * Prefixes**: convert units such as kN (kilo-newtons) and mA (milli-amperes) by multiplying or dividing by 1000.
 * Assumptions**: many formulas can only be used with particular assumptions eg a fixed mass of gas