These are the questions to answer from the clip: 1. What are the two layers in the walls of UK homes?
2.What is put in the gap/cavity between these layers
3.Does this have a high or low thermal conductivity?
4.Why is double glazing used in windows?
5.How do we reduce energy loss from the roof?

What is special about a dc circuit ?

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Rank the six combinations of electric charges on the basis of the electric force acting on q1. define forces pointing to the right as positive and forces pointing to the left as negative. rank positive forces as larger than negative forces. q1,q2,q3 = positive(+) q1 = + q2 = + q3 = - q1 = + q2= - q3= + q1= - q2= + q3= + q1= + q2= - q3= - q1,q2,q3 = negative