A40kg rock is perched atop a cliff that is 50 m high. what is it’s potential energy?

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

The smallest particle of an element that retains its identity in a chemical reaction. true or false

Abody covers a semicircle of radius 7cm in 5s .find its linear speed