You move a 4 N object 10 meters. Find work.
Then find power if it is done in 5 seconds.

W= 40 J

P = 8 W

Explanation: Solution for work:

W = F d

= 4N ( 10 m)

= 40 J

Solution for Power:

Power is the ratio between work per unit time.

P = W /t

= 40 J / 5 s

= 8 W

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 total distance traveled by the car is

30km + 49km = 79 km .