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Three forces of magnitude 50N, PN, QN all act in a horizontal plane in equilibrium. The diagram shows the forces. DIAGRAM: QN = EAST, 50 = SOUTH, PN = 120 DEGREES ANTICLOCKWISE FROM QN a) Find P. b) Find Q.

a) Resolving vertically: Pcos(120-90)=50. Find P from this equation.b) Resolving horizontally: Psin(120-90)=Q. Find Q from this solution.

Answered by Chloe J. • Maths tutor

4098 Views

How would you use the Integration Factor method to solve an ordinary first-order linear differential equation?

The word "ordinary" means that there are only two variables, "first-order" means that the highest derivative is the first derivative and "linear" means that the highest power...

Answered by Kelvin C. • Further Mathematics tutor

2753 Views

You have a layer of glass with a refractive index of 1.5 and the glass is surrounded by air. A light ray shines into the glass and Total Internal Reflection occurs at the glass-air boundary. What is the critical angle?

This question tests your knowledge of Snell's law, Total Internal Reflection (TIR) and the fact that the refractive index of air is 1 (which should be memorised as it is in the exam). The critical angle i...

Answered by Kelvin C. • Physics tutor

3659 Views

Explain 2 evaluation points of the BSRI (Bem Sex Role Inventory) (6 marks)

The BRSI appears to be a valid and reliable measuring scale for androgyny as there is support from a pilot study of 1000 students using the BRSI, and their results reflected their own descriptions of thei...

Answered by Emily T. • Psychology tutor

14053 Views

How do you know when to use the subjunctive?

Let’s start with the difference between indicative and subjunctive. These are what we call the two possible MOODS for a verb to be in. The subjunctive is often used to indicate subjectivity, uncertainty o...

Answered by Alice B. • French tutor

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