Hagen-poiseuille equation: calculate, using the hagen-poiseuille equation, the pipe diameter needed for a volumetric flow rate of 0.01 m2 /hour of water, for which the pressure drop shall be no more than 40 kpa per 100 m run of straight horizontal pipe. once you have determined the pipe diameter, then verify that the hagen-poiseuille equation is the proper one to use by calculating the value of the reynold's number

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.

grav forces affect all objects magnetic forces affect magnetic objects and electric currents