Proposed Exercise: Conservation of Energy in Planar Motion of a Rigid Body The system illustrated in the figure below consists of a 3-kg disk A and a 10-kg disk B connected by means of a rope to a 2-kg suspended cylinder. If the system is released from rest, how far must the cylinder move so that disk B reaches an angular velocity of 6 rad/s? Assume that the rope has no mass and does not slide

an obstruction

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.

ice to water 1 water to vapour 2 latent heat

scientific laws are the result of testing theories and proving them to be facts.