Consider the four free body diagrams. in which case does the net force equal 15n up a b c d

Argon is adiabatically compressed from an initial volume of 16 liters to a final volume of 2 liters. by what factor do the following quantities change? do they increase or decrease? (a) the rms speed (b) the thermal energy of the gas (c) the molar specific heat cv (d) the pressure

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration