How many calories are absorbed by a sample water with a mass of 500 grams as it changes from 50 degrees c to 65 degrees c?

H = mCpT

H = (500 grams water)( 4.18 J/ g - degrees C) (65 - 50)

H =31,350 J

since 1 cal = 4184 joules

31,350 Joules (1 calorie/ 4184 joules) = 7.49 calories

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.