OpenStax College Physics, Chapter 14, Problem 13 (Problems & Exercises)
Isn't the specific heat of water 4184 J/ kg C instead of 4186 J/kg C? I thought it was equivalent to 1 kcal
Hi mengar90, thank you for the question. The value I'm using is from Table 14.1 in the OpenStax textbook. Specific heat is temperature and pressure dependent so it's normal to see different values mentioned in different sources depending on the pressure/temperature each source is assuming. The OpenStax text assumes and 1 atmosphere of pressure.
kcal is a unit of energy, and yes you're correct that it's 4184 joules, but note the units. The comparison is between two different units for energy: kcal vs. J, not kcal vs J / kg C.
Hope this helps,