For a gravitational field to be generated between two objects, what must be true? No other forces can be presents
The two objects must be in contact
One object must be pure iron
Both objects must have mass

The diagram shows the relationship between scientific disciplines. the names of some scientific disciplines have been removed from the boxes. which scientific discipline belongs in the blue box? a. physics b. biology c. chemistry d. metallurgy

How do you determine the percent yield of a chemical reaction

Anitrogen atom and an oxygen atom combine chemically to form nitric oxide. what is nitric oxide?