Acube of tin with a mass of 1.90 kg, initially at a temperature of 150.0°c, is in a well-insulated container.
water at a temperature of 20.0°c is added to the container, and the entire interior of the container is allowed to come to thermal equilibrium, where it reaches a final temperature of 60.0°c.

what mass of water (in kg) was added? assume any water turned to steam subsequently recondenses.

f is prop to m1xm2 double m1 double force

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.

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 =