Search our library of homework questions

Top answers

All subjects

All levels

How do I learn and memorise case studies?

Learning the facts of case studies can seem very daunting at the beginning - with all of the names, dates and facts and figures. But, really, it's no different to learning anything else!

...

Answered by Paven U. • Geography tutor

10040 Views

Convert the general complex number z=x+iy to modulus-argument form.

Modulus-argument form implies that we should express z in terms of its straight line distance from the origin and the angle this straight line would make with the x axis. This is expressed as z = r e

Answered by Ben H. • Further Mathematics tutor

10112 Views

Solve the equation; 4 cos^2 (x) + 7 sin (x) – 7 = 0, giving all answers between 0° and 360°.

4 cos² (x) + 7sin (x) – 7 = 0 (1)

Using the identity sin² (x) + cos² (x) = 1,

rearrange to give; cos² (x) =...

Answered by Connor S. • Maths tutor

17883 Views

Explain in terms of the motion of the molecules of the gas why the volume of gas must increase if the pressure is to remain constant as the gas is heated.

- When gas is heated, the molecules gain kinetic energy.

This causes more collisions of greater force per unit time with the wall of the container.
If the pressure i...

Answered by Connor S. • Physics tutor

8759 Views

A spherical object of mass 150kg is orbiting the Earth. The distance between the centre of the object and the centre of the Earth is 25,000m. What is the kinetic energy of the object?

This is an example of circular motion caused by a centripetal force. In this case, the centripetal force is the gravitational force between the Earth and the object. Linking the equations for circular ...

Answered by Ryan L. • Physics tutor

2588 Views