What does the second law of thermodynamics state? A. No heat engine can convert all the heat input into usable work energy.
B. Entropy of systems in nature always decreases as they run.
C. Matter cannot be created or destroyed; it can only change forms.
D. Energy cannot be created or destroyed; it can only change forms.

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.

What are the necessary conditions for fusion?