A car that has a mass of 1,500 kg is supported by four springs that have a spring constant of 10,500N / m. The car was boarded by a family with a total mass of 180 kg. When the car crosses the bridge, decide a. the frequency of vibration of the spring of the car
b. period of vibration of the car spring
c. the time needed to travel the five vibrations

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.

the closer the planet is to the sun, the larger the gravity