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

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm