Search our library of homework questions

Top answers

All subjects

All levels

The straight line joining the points (1, -2a),(a, 1) has a gradient of 5, find the value of a

m=y-y₁/x-x₁5=1-(-2a)/a-15=1+2a/a-15(a-1)=1+2a5a-5=1+2a3a=6a=2

Answered by Theo B. • Maths tutor

3632 Views

Metals can be extracted fromt their oxides via the process of electrolysis. Positive metal ions are attracted to the negative electrode. explains what happens at the negative electrode. (2 marks)

Metal ions gain electrons to form metal atoms.(Eg Al3+ + 3e- ----> Al)

Answered by Tamsin D. • Chemistry tutor

2153 Views

A 80kg man is hanging from two 1.5m ropes that lie at 60 degrees from the horizontal. What is the tension in each rope required to prevent the man from dropping?

The man is 80kg so the downward force exerted by his weight is 80g (where g is the force of gravity equalling 9.8 Newtons (2dp)). Therefore the upward force exerted by each rope must equal 40g. Using tri...

Answered by Dominic D. • Physics tutor

1897 Views

Differentiate y=x^2 from first principles

y=x²dy/dx= Lim_h-->0( ((x+h)²-x²) / (x+h-x) )dy/dx= Lim_h-->0( (x² + 2hx + h² - x²) / h )dy/dx= Lim_h-->0...

Answered by Dipayan C. • Maths tutor

5506 Views

A line has Cartesian equations x−p = (y+2)/q = 3−z and a plane has equation r ∙ [1,−1,−2] = −3. In the case where the angle θ between the line and the plane satisfies sin⁡θ=1/√6 and the line intersects the plane at z = 0. Find p and q.

This question gives hints as to how you should solve it. Because it tells you the angle between the line and the plane, this should indicate that doing something to do with finding the angle between the l...

Answered by Joss O. • Further Mathematics tutor

3612 Views