A19.0-kg cannonball is fired from a cannon with muzzle speed of 1 200 m/s at an angle of 35.0° with the horizontal. a second ball is fired with the same initial speed at an angle of 90.0°. let y = 0 at the cannon. (a) use the isolated system model to find the maximum height reached by each ball. hfirst ball = incorrect: your answer is incorrect. do not try to use equations involving projectile motion. this problem is much more straightforward to solve using energy conservation. m hsecond ball =what is the expression for the total mechanical energy just after the cannon has been fired? what is the expression for the total mechanical energy when the cannonball reaches its maximum height? m (b) use the isolated system model to find the total mechanical energy of the ball❝earth system at the maximum height for each ball. efirst ball = incorrect: your answer is incorrect. how does the total mechanical energy at the maximum height compare to the total mechanical energy immediately after the cannon was fired? j esecond ball =

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.

d. air pressure decreases as altitude increases.