1) Work done to lift any body against gravity = mgh

2) Power is inversely proportional to time

3) Atm Pressure is measured by vertical height above the Hg surface using a barometer, P = hdg

4) Air blown increases the rate of evaporation. As water molecules evaporate they take heat from the water, thus cooling it.

5) Heat = mc dt;  c= specific heat capacity which depends on the material

6) in echo problems, v= 2d/t ; since the sound wave is travelling to and fro
IGCSE Math papers 2, 4 and 6

Pg 256 Ex 10.3 sum 1 a to f, 2
Pg 258 Ex 10.4 sum 1, 2, 4, 5, 6, 7,

Acute angle is less than 90

Obtuse angle is more than 90 but less than 180

Mayank: Eco resources: MJM Foodie and Dinesh Baxi
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Wave Motion

Whenever a wave passes through a medium, only energy is transferred, the particles vibrate about their mean position

Transverse Wave: particles of the medium vibrate perpendicular to the direction of transfer of energy

Longitudinal waves: the particles of the medium vibrate along or parallel to the direction of transfer of energy