A human being is an example of a thermodynamic system. A person riding a bicycle at a moderate speed does mechanical work on the pedals at a rate of about 100 W. At the same time, she gives off some heat, 400 W to her surroundings as she sweats and so forth. Suppose a cyclist rides for 1 h. What is the change in her internal energy?​

b.

explanation:

10.0

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.

grav forces affect all objects magnetic forces affect magnetic objects and electric currents