An electrician is trying to decide which kind of material to use to wire a house. carbon steel: conductivity = 1.43 × 10−7, resistance = 1 × 1010 copper: conductivity = 5.96 × 107, resistance = 1.68 × 10-8 gold: conductivity = 4.11 × 107, resistance = 2.44 × 10−8 iron: conductivity = 1 × 107, resistance = 1.0 × 10−7 Based on this information, which material should the electrician use? A. iron

B. carbon steel

C. gold

D. copper

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1= 26.17

2= 1.17

3=30.86

4=5.86

just took the assigment on edge

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg

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 =

u

explanation: