What are some scary ghost stories that you have read online?

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 slope of a velocity time graph over any interval of time gives the during that interval

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in