De ani desciende. Realiza un dibujo donde tengas la siguiente situación: una bala de cañón

arrojada de manera vertical, con una velocidad inicial de -50 m/s. ¿Cómo

debes dibujar el vector aceleración de la gravedad? ¿Qué pasa en la altura

máxima con la velocidad? Dibuja claramente el sistema de referencia.

divide the right side by the left side

0.024÷1.2=0.02 for example

b

explanation:

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 observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue