Acup of coffee (140g) cools from 75°c down to comfortable room temperature 20°c. how much energy does it release to the surroundings

Given that the mass of coffee in the cup = 140 g

Final temperature =

Initial temperature =

Let us assume the specific heat of coffee is equal to that of water = 4.184

Temperature change = T(final) - T(initial) = (20 - 75 )

                                                                   =- 55

-Heat given out by coffee = heat absorbed by the surroundings

Heat released into the surroundings =-()

                                             =

                                             = 32,217 J

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)