PLEASE HELP DUE TOMORROW

What type of nuclear decay causes the atomic number of an element to increase by 1?

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

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.