The acceleration due to gravity on Neptune is 14.1m/s^2. What is the weight of a 45 kg astronaut on Neptune?

The pressure, volume, and temperature of a mole of an ideal gas are related by the equation pv = 8.31t, where p is measured in kilopascals, v in liters, and t in kelvins. use differentials to find the approximate change in the pressure if the volume increases from 14 l to 14.6 l and the temperature decreases from 375 k to 370 k. (round the answer to two decimal places.)

In a system, when potential energy decreases, then entropy also decreases. true false

What is friction? how does it affect the motion of an object?