Question 1 (1 point) -
A 400-m, 800-m, and 1600-m race are all run around the same 400-m oval track.
The winning times for the races were 50 s, 2 min, and 4 min 10 s respectively. Which
of the following statements is true?
3
a) The 400-m runner has the greatest average velocity.
9
b) The 1600-m runner has the greatest average velocity.
12
c) All runners have the same average speed.
15
d) All runners have the same average velocity.
e) The 800-m runner has the greatest average velocity.
arch

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 =

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.