1. calculate the momentum of a 50kg carton that slides across an icy surface at 4 m/s.

The momentum of the carton, P = 200 kg • m/s

Explanation:

Given that,

Mass of the object, M = 5 Kg

Velocity of the object, V  = 1.2 m/s

The product of the mass and velocity of the body is defined as momentum. It is denoted by 'P'.

                                     P = MV

Substituting the values in the above equation

                                     P = 50 Kg x 4 m/s

                                        = 200 kg • m/s

Hence, the momentum of the object is P = 200 kg • m/s

volume: 22

density: 7.04

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.