Top answers

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! Here are my top tips...
PU
Answered by Paven U. • Geography tutor
12239 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 i*theta...
BH
13524 Views

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

4 cos 2 (x) + 7sin (x) – 7 = 0 (1) Using the identity sin 2 (x) + cos 2 (x) = 1, rearrange to give; cos 2 (x) = 1 - sin 2 (x) (2) Sub (2) into (1) ... Giving; 4 ( 1 - sin 2 (x) ) + 7sin (x) - 7 = 0 Expand br...
CS
Answered by Connor S. • Maths tutor
19464 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 is constant, then fewer collisions per unit...
CS
Answered by Connor S. • Physics tutor
10155 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 motion...
RL
Answered by Ryan L. • Physics tutor
3362 Views