Yulia is twenty-four years old. She has been fit and lean her whole life and recently has begun to put on an unhealthy amount of weight. She goes to her doctor because she is not eating any differently than she has before, yet she is no
heavier. What will Yulia's doctor most likely tell her?
O Adults need fewer calories than kids and teens, so she needs to eat less.
O Adults need more calories than kids and teens, so she needs to eat more.
O Adults are heavier than kids and teens.
O Adults need more exercise than kids and teens.

How many milliliters of water at 23 °c with a density of 1.00 g/ml must be mixed with 180 ml (about 6 oz) of coffee at 95 °c so that the resulting combination will have a temperature of 60 °c? assume that coffee and water have the same density and the same specific heat. how much will the temperature of a cup (180 g) of coffee at 95 °c be reduced when a 45 g silver spoon (specific heat 0.24 j/g °c) at 25 °c is placed in the coffee and the two are allowed to reach the same temperature? assume that the coffee has the same density and specific heat as water. a 45-g aluminum spoon (specific heat 0.88 j/g °c) at 24 °c is placed in 180 ml (180 g) of coffee at 85 °c and the temperature of the two become equal. (a) what is the final temperature when the two become equal? assume that coffee has the same specific heat as water. (b) the first time a student solved this problem she got an answer of 88 °c. explain why this is clearly an incorrect answer.