2. (15 points) A dust speck (m = 1 ng) travels horizon- tally at speed u until it hits an ice cube of mass M = 1g
that is sitting at rest on a horizontal frictionless surface.
Having absorbed the dust speck, the ice cube proceeds
to travel horizontally with speed v = 3 ms-1.
What was the initial speed, u, of the dust speck?

Hints: (1) 1 ng = 10-9g. (2) See if you can figure out
why Newton would have gotten this question wrong.
What is the relativistic momentum? Do you need it for
the ice cube? How about the speck of dust?
U

well, you would divide 135 by 33 to get your answer. then that is how many seconds it would take. boardman should fly about 132 m or 4.090909090909091 seconds.

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

force tends to be low and long diustance masses are high

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 =