The arrows in the figure represent the
gravitational force between marbles that
have egual mass
how should the force arrows look if a
marble that has greater mass replaces one
of these marbles?
a. both arrows should be drawn longer
b. both arrows should stay the same
length,
c. the arrow from the marble with less
mass should be longer than the other
arrow,
d. the arrow from the marble with less
mass should be shorter than the other
arrow,

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

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.

it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.