Many cultures around the world still use a simple weapon called a blowgun, a tube with a dart that fits tightly inside. a sharp breath into the end of the tube launches the dart. when exhaling forcefully, a healthy person can supply air at a gauge pressure of 6.0 kpa.
what force does this pressure exert on a dart in a 1.4-cm-diameter tube?

force is 0.923 N

Explanation:

given data

gauge pressure = 6.0 kPa = 6 × Pa

diameter = 1.4 cm = 1.4 × m

to find out

What force does this pressure exert

solution

we know here force formula that is

force = pressure × area

here pressure is given and area will be area = πr² = π×

so

force = 6 × ×π ×

force = 0.923 N

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.

pretty sure it's false