A roller coaster car rapidly picks up velocity as it rolls down a slope. As it starts down the slope, its speed is 8 m/s but after 5 seconds, its velocity is 23 m/s. What would the acceleration of the car be? Group of answer choices 3 m/s/s 2 m/s/s 6 m/s/s 5 m/s/s

3m/s/s

Explanation:

initial velocity=8m/s

Final velocity=23m/s

Time=5s

Acceleration=change in velocity/time

=(23-8)m/s÷5s

=15m/s÷5s

=3m/s/s

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.

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true