A firecracker sits on the concrete and explodes into two pieces that fly away from each other. the first piece has a mass of l kg and is moving at -30 m/s if the second piece has a mass of 3 kg how fast will it move after the explosion

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.