Abody was found at 10 a. m. outdoors on a day when the temperature was 40of. the medical examiner found the temperature of the body to be 80of. what was the approximate time of death? use newton's law of cooling, with k = 0.1947.

8 am

Explanation:

Equation of newtons law of cooling is  -

Where is ambient temperature which is equal to

80 degree Fahrenheit

degree Fahrenheit

Substituting the given values in above equation we get -

Taking log on both sides we get -

hour

which is almost 2 hour

So the time of death would be two hour before 10 am

i.e 8 am

plant because they survive by water, sunlight, ex.

explanation:

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.