If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Course: High school physics - NGSS > Unit 4

Lesson 4: Thermodynamics
Science
High school physics - NGSS
Modeling energy
Thermodynamics
© 2024 Khan AcademyTerms of usePrivacy PolicyCookie Notice

Apply: thermodynamics

Google Classroom
You might need: Calculator

Problem

A power plant that uses steam to turn turbines produces 40.0°C hot water. The manufacturer must cool this water before releasing it. So, the manufacturer mixes every 1.00kg of its hot water with 3.00kg of 20.0°C water.
Calculate the final temperature of the water.
Round your answer to the nearest tenth.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
°C