Aristotle said that the quickness of a falling object varies inversely with the density of the medium through which it falls. (a) according to aristotle, would a rock fall faster in water (density 1000 kg/m3), or in air (density 1 kg/m3)? air water?

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

Anybody wanna ? (picture included? )

If 2 moles of co_2 at 2l and 500k are expanded reversibly to 20l, more work can be obtained from an adiabatic process than from an isothermal process. is the above statement true or false?