Marc and Rick are pushing on opposite ends of the box shown above. Marc is pushing on the box with a force of 5 N. Rick is also pushing on the box with a force of 5 N. In which direction will the box move? A.
The box will move towards Marc because he is pushing with more force.
B.
The box will move up because the forces will be combined.
C.
The box will move towards Rick because he is pushing with more force.
D.
The box will not move because the forces are balanced.

where's the following? you gotta add it to know what the choices are

explanation:

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.

hypothesising or postulating

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.