26. stand with your heels and back to the wall and lean over and touch your toes…. what yep, you topple. which would you in completing this task, stronger legs or longer feet? use 2 to 3 complete content related sentences to defend your answer.
30. you are playing catch with a friend in a moving train. when you toss the ball in the direction the train is moving, how does the speed of the ball appear to an observer

26 ) Stronger legs

30) the ball appear to have greater sped than that of the train to an observer on the earth.

Explanation:

26) Longer feet will raise the centre of mass of the body,

reducing its stability. Lower the centre of mass , greater the stability of a body.

30) The velocity of the train will add up with the velocity of ball with respect to train to give its velocity with respect to the earth.

answer :

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.