In a generator, mechanical energy is converted into which of the following?
an electromagnet
a moving rod
a magnetic field
electrical energy

The air that we breath is made mostly of which gaseous molecule

What efficiency of a car's engine when heat input is 200,000 joules and waste heat is 150,000 joules? a. 75% b. 35% c. 25% d. 85%

X-ray crystallography is used to see the structure of molecules. scientists have used the technique to find the structure of cholesterol an important biological molecules knowledge of a structure of cholesterol is because it may affect?