5. Air enters a compressor operating at steady state with a pressure of 14.7 psia, a temperature of 80 F, and a volumetric flow rate of 18 ft3/s. The air exits the compressor at a pressure of 90 psia. Heat transfer from the compressor to its surrounds occurs at a rate of 9.7 BTU/hr per pound of air flowing. The compressor power input is 90 hp. Neglecting kinetic and potential energy effects, and modeling the air as an ideal gas, determine the exit temperature (F).

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

+15-35=-20

going in opposite directions