sound travels faster in steel than in water. Suggest difference an explanation for this [2] (b) Traces of two different sound waves, S1 and 52, are drawn on the same scale in Fig. 8.1 S1 S2 3 time time Fig. 8.1 State two ways in which S1 differs from S2 [2]

volts times amps 6 x 0.5 3w

well clustered together.

points close on a scatter diagram

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =