A heat engine produces 8200 j of heat while performing 3200 of useful work. what is the efficiency of this engine? (i'm doing something wrong.)

Which statement correctly describes the motion on which an Earth time interval is based? A. Earth's year is based on the sun's revolution. B. Earth's day is based on the Earth's rotation. C. Earth's day is based on the sun's revolution. D.

What are three objects in a home that produce electromagnetic waves?

The Greek philosopher Democritus coined what word for a tiny piece of matter that cannot be divided? A) Element B) Atom C) Electron D) Molecule

Causes cold nutrient rich waters to move up to the oceans surface

A lever is used to lift a heavy weight. The length of the input arm of the lever is 3 m, the length of output arm is 1 m. What is the mechanical advantage of the lever? 3 1 4 0.33

What are the three properties of gravity

How do matter and energy interact?

What is something that has a lot of thermal energy?

Why do we use a shunt on the galvanometer

Two of the element sodium combine with one of the element chlorine to form the sodium chloride.