Currently unavailable: for regular students
Degree: Computer Science (Bachelors) - Cambridge University
|Computing||A Level||£20 /hr|
|Further Mathematics||A Level||£20 /hr|
|Maths||A Level||£20 /hr|
|Physics||A Level||£20 /hr|
|Further Mathematics||GCSE||£18 /hr|
|.STEP.||Uni Admissions Test||£25 /hr|
|STEP Mathematics I||Uni Admissions Test||S|
|Before 12pm||12pm - 5pm||After 5pm|
Please get in touch for more detailed availability
Kevin (Student) October 1 2016
Kevin (Student) September 10 2016
Mariam (Parent) September 10 2016
There are two obvious approaches here:
1. Solve the equation x2 - 2x + 2 = 0 to find A and B and then calculate the required values.
2. Or we can use the quicker method of analysing what it means for the expression to have these two roots.
It implies that the expression on the left hand side can be factorised into the form (x - A) (x - B) as this provides the solutions x = A, x = B to the equation (x - A) (x - B) = 0. Expanding this out in general gives x2 - (A + B) x + A * B = 0.
By comparing the two equations we can then read off from the coefficients that - (A + B) = - 2 and A * B = 2. So we now have the answers:
A + B = 2
A * B = 2
There are two postulates of special relativity:
1. The laws of physics are invariant in all inertial frames of reference.
What this means is that if we have a description for how physical systems undergo change in one frame F, then that should remain the same in another frame F' as long as F' is only moving at a constant velocity relative to F. Note that a frame of reference is just a set of coordinate axes against which we can measure positions in space and time. Inertial means that it is non-accelerating.
2. The speed of light in a vacuum is the same for all observers, regardless of the motion of the light source.
This means that regardless of how the light source is moving with relative to the observer, the speed of light will be measured as a constant c.
From these postulates we can then derive the consequences such as length contraction, time dilation, universal speed limit etc.