A20n force pulls to the right and friction pulls 5n.
if the mass is 5kg, find the acceleration

Answer : The acceleration is, 3 m/s²

Explanation :

As, a 20 N force pulls to the right and friction pulls 5 N which is less.

Friction force is the force that applied to the opposite direction of the motion of an object.

That means, these two forces are applied in opposite direction.

So, net force will be, 20 N - 5 N = 15 N

Now we have to calculate the acceleration.

Formula used :

Force = Mass × Acceleration

Now put all the given values in this formula, we get:

15 N = 5 kg × Acceleration

Acceleration = 3 m/s²

Therefore, the acceleration is, 3 m/s²

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.

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.