Top answers

Find the positive solution to the equation (x^2+9x+18)/(x^2-9)=10

If we first factorise the top and the bottom of the equation we can see that the top is equal to (x+6)(x+3) and the bottom is (x-3)(x+3). This means we can divide the top and bottom by (x+3) giving us a resu...
JR
Answered by Joseph R. • Maths tutor
3566 Views

Sketch a graoh of current against potential difference for a filament lamp and explain its shape.

(draw diagram on whiteboard) As the potential difference increases, the current increases, since V=IR (where V is the potential difference, I is the current and R is the resistance). Initially the current in...
TD
Answered by Tamanna D. • Physics tutor
3083 Views

Explain how the photoelectric effect gives evidence for the photon theory of light.

When light is shone onto a piece of metal, if the light is below a certain frequency, no photoelectrons are emitted. Only if the light is above a certain frequency, known as the threshold frequency, are phot...
TD
Answered by Tamanna D. • Physics tutor
11066 Views

(e*sqrt(e))/cuberoot(e^2)=e^k find k

This an indices question. What you need to do is simplify the left hand side so that you have e to some power and that will give you k. You can start with the rule that square roots and cube roots are 1/the ...
TD
Answered by Tamanna D. • Maths tutor
3653 Views

Outline the process of the light independent reaction in photosynthesis, also known as the Calvin cycle.

Light INDEPENDENT reaction:· RuBP combines with CO 2 , using Rubisco which is an enzyme that catalyses the reaction· This forms 2x GP molecules· Each GP is reduced to form TP, using reduced NADP which provid...
JA
Answered by Johana A. • Biology tutor
3517 Views