Select all that are correct. 3. According to Newtons 1st law, which of the following would be true?

f. An object at rest will stay at rest.

g. An object in motion will stay in motion.

h. An object in motion or at rest will have a net force of zero.

i. Acceleration will be zero for object showing Newton’s 1st law.

j. Acceleration goes in the opposite direction of the net force.

4. Inertia is

a. A body's resistance to motion change.

B. The same as weight

C. The same as mass.

D. Is associated with the first law of motion

5. Newton's 2nd law must use (F= ma)

a. The friction force

b. The net force

C. The applied force

d. The normal force.

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.

small = small current large mag large current

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me