Aboxcar of mass 8700 kg is traveling at 11.0 m/s strikes a second boxcar moving in the same direction at 2.2 m/s. the two stick together and move off with a speed of 4.00 m/s. what is the mass of the second box car? explain your reasoning.

m = 33833.3 kg

Explanation:

let M be the mass of boxcar 1 and V be the velocity of boxcar 1, let m be the mass of boxcar 2 and v be the velocity of boxcar 2.

from conservation of linear momentum:

M×Vi + m×vi = vf(M + m)

M×Vi - M×vf = m×vf - m×vi

    M(Vi - vf) = m(vf - vi)

                m = [M(Vi - vf)]/(vf - vi)

                    = [(8700)(11.0 - 4.00)]/(4.00 - 2.2)

                    = 33833.3 kg

Therefore, the mass of boxcar 2 is 33833.3 .

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explanation:

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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.