The radius of an asteroid's orbit about the sun is approximately two times the radius of Earth's orbit about the Sun. Measured in Earth years, the time for the asteroid to make one complete revolution about the Sun is most nearly a. 8.0 years
b. 2.0 years
c. 1.4 years
d. 2.8 years

a=d/t

a="triangle"v/t

explanation:

a = acceleration

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

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 =