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To find the height we first need to find the initial vertical velocity of the stone. This will be equal to 20 * sin(30) = 200.5 = 10m/s. From here we can use SUVAT. In this case s=-h,u=10m/s, v is unk...
This question can be solved using the elimination method. Set out the problem as follows: x+3y=11 - x+2y=9 0+y=2 => y=2 Therefore one can substitute the val...
first of all you would see that at the bottom of the fraction it is not an integer so first of all you would need to rationalise the denominator. the denominator is the bit at the bottom of the fraction. ...
To get our head around a problem like this is always very useful to think of a few examples. First supposed that this party is a bit borining and there are only 2 people, then by assumption they know each...
To help explain we will use the following example: Show that cos(2x) = 2cos2x - 1. Hence solve the equation cos(2x) + cosx = 0 for 0o < x < 360o. Answer: We know fro...
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