• The airplane traveling horizontally at 50 m/s • The airplane is 150 m above the sea
1. Define your reference coordinate system
2. Find the x-component of velocity after 2 sec.
3. Find the y-component of velocity after 2 sec.
4. Write the vector of velocity after 2 sec in terms of “I” and “j” components (vector representation).
5. Find the speed and the clockwise angle does the velocity vector makes with the x-axis after 2 sec.
6. Find the height above the sea after 2 sec.
7. Find the horizontal distance relative to point at which the package was released after 2 sec.
8. Find the (x, y) components when the package strikes the sea and write this final displacement in its vector
representation.
9. Write the displacement vector ⃗ as a function of time and find by calculus the acceleration vector ⃗⃗ .
10. Compare the acceleration vector you have got from Part.9 with the known projectile motion values.

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.

change tension